A guy who prefers screwing fat chicks, simple as that. Ahab is a reference to the captain of the ship that was chasing the giant white whale in Moby Dick.
That chick was so huge she had her own gravitational force and that guy that left with her had to be an ahab
by Brian H October 25, 2005
While fucking your girl doggie style, you suddenly pull out for no apparent reason. When she turns around for an explanation, she notices you've jumped off the bed onto a skateboard, holding the mighty dildo-harpoon in hand, cocked and ready to spear her in the ass. You pursue her as she runs out of the house and down the street while yelling, "You're not getting away from me this time, White Whale!"
The above definition is an example
by MC Menses December 02, 2004
Someone who owns the Homeworld 1 and Diablo 2 communities like no other game known. He is mean, rude, and basically Satan. Watch for his evilness, as he will crush your pathetic cry baby souls.
Ahab has yet again ate the soul of an unsuspecting cry baby carebear.
by Jesus November 19, 2003