LEARN THE DOTA'S COMMON TERMS

As a Science, we have our own common terms. So check this out :

Player Abbreviations
OJ	Orange
LB	Light Blue
DG	Dark Green
Areas On The Map
Mid	Middle lane. The line traveled by the creeps through the center of the map.
Top	Top lane. The line traveled by the creeps through the west and top portions of the map
Bot	Bot lane. The line traveled by the creeps through the bottom and east portions of the map.
Woods	The areas in between lanes where neutral creeps are found.
Jungle	Same as woods.
Item Abbreviations
AC	Assault Cuirass
Aghs or Agha	Aghanim's Scepter
BKB	Black King Bar
Blink	Kelen's Dagger
BoT	Boots of Travel
Crow	Flying Courier
Deso	Stygian Desolator
DR	Divine Rapier
Hex	Guinsoo's Scythe of Vyse
HotD	Helm of the Dominator
HoT	Heart of Tarrasque
Mek	Mekansm
MoM	Mask of Madness
Phase	Phase Boots
PT	Power Treads
RoB	Ring of Basillus
RoR	Ring of Regeneration
RoH	Ring of Health
Sheepstick or Sheep	Guinsoo's Scythe of Vyse
SnY	Sange and Yasha
Vlads	Vladimir's Offering
Basic Need To Know Terms
Farm	Farming up gold. Refers to the act of systematically killing creeps in order to earn gold. Even when you are virtually killing creeps all game long, you say that someone is "farming" when they are completely dedicated and concentrated on that.
Focus	Means to concentrate all attacks on a specific target (I.E "Focus Lina" means that Lina should be the primary objective and that all the team should have attacking her as a priority in team fights)
Harass	Relative to the act of putting pressure in your enemy by attacking him during the laning period. Basically, harassing is attacking the enemy in front of you in the lane, so as to make him an easy target for a gank or to prevent him from farming freely. Therefore, "harass Ezalor" means that you should try to damage Ezalor with your skills/attacks.
Juke	Juking, means to make deceptive maneuvers with your hero while moving, so as to delude your opponent and make it harder for him to predict where you will be heading. This is used mainly to escape while you are being chased, or to make your enemy miss/misuse a spell (for example Avalanche, which has to be targeted to the ground).
Pull	Creep Pulling. Getting creeps from a neutral camp to follow you into the path of your lane creeps.
Spam	Spamming your spells, refers to the act of repeatedly using a certain spell, a lot. "spam carrion swarm" means casting Carrion Swarm a lot, most generally as soon as the cool down is up.
Rosh	Roshan. Refers to Roshan, the big neutral creep next to the river just below the middle lane. Usually indicates the player's belief that either the enemy team is killing Roshan right now or that the player's team should kill Roshan now.
Gank	Bringing several heroes to gang up on a target to kill them. "Gank lina," is a request for you to come help kill her.
b	Back. If your allies start calling "b," get out immediately, it usually means that you're getting ganked. This is a more urgent warning than a miss or mia call.
TP	Teleport. A request for you to use a Scroll of Town Portal or Boots of Travel to come assist in a fight. "tp mid now"
Def	Defend. Self-explanitory, "tp to def mid"
Push	Traveling down a lane as a team in order to work together to fight and kill enemy buildings.
DD	The Double Damage rune.
Hero Missing/ Returning Calls
miss	Missing. A warning that enemy heroes have gone out of view and might be ganking, so be careful. Usually said with a hero name, such as, "Lina miss."
mia	Missing in action. Same thing as miss, such as, "Lina mia."
re	Returned. The opposite of a miss/mia call, "Lina re" means that she's back in the lane she came from and you don't have to worry about her.
Hero Descriptions
nuke	A generic term for any spell that does damage. "Nuke him" just means throw your damage spell, pretty much no matter what hero you have.
ult	Ultimate. Any hero's level 6 ability is refered to as their ultimate
oom	Out of mana. Don't expect any more spells from this player during the fight.
mana	Just saying "mana" usually means the same thing as oom
cd	Cooldown.Should usually be interpreted as, "Hold on, the spell I need isn't up yet." Also, you might see something like, "ult cd 30" which means, "My ultimate is still cooling for about 30 more seconds."
stacked	Stacked of items, means that a hero has gotten many and powerful items, therefore making him really hard to take down. "Nevermore is stacked" means that Nevermore has many and good items.
farmed	Same as stacked.