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1.
Often used on online forums and the Star Wars Galaxies Bloodfin community.
Pegasus, a member of a guild Dread would scream in ventrilo during PvP and when people asked him what he said, he said HACB was an abbreviation for
Holla
At
Cha
Boy

Nexis made this term popular in the bloodfin community after
using it excessively on the forums.
Lol, vass. You sucked 2 cocks last night while brisc licked your dog's ass. HACB!
by Tildeboy June 04, 2006
 
2.
Holla At Cha Boi
Hey man - that was a great weekend! Lemme know when we gonna do it again.

HACB
by zpoley July 10, 2008
 
3.
Horny As Can Be
Mixster is HACB after seeing that movie.
by otis147 July 24, 2009