What is 4 Pool?
The gayest tactic possible in the game of Starcraft.
A Zerg player builds a spawning pool before a single drone, while his supply is still at 4. Hence, 4-pool. This is the fastest possible zergling rush.
Doesn't work as well since spawning pool cost was raised to 200.
I pwn you with 4 pool, n00b! fear my incredible skillz!