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1.
In a bad situation, in a losing position.

The phrase comes from pool (or billiards). When the cue (white) ball is behind the eight (black) ball, a player usually has no shot.
I'm really behind the eight ball at work. I have too much work to do but we can't afford to hire anyone to help out.
by VAKI5 May 11, 2005
 
2.
in an awkward or uncomfortable position
Having accepted two different invitations to dinner Saturday night, Clare found herself behind the eight ball.
by epm December 07, 2003
 
3.
In trouble; make worse
"dude I'm behing the eight ball, can you help me!!!!"
by unknown May 27, 2003
 
4.
Pool or pocket billiards term meaning: You are about to lose a game of eight ball because the opposing player is shooting the eight ball to win the game, and you are there standing or sitting behind it.

Has come to modern usage meaning you are in a bad situation or about to lose....or lost someone or something.
That new guy who was a math wiz left today: now we're really behind the eight ball.

I've been behind the eight ball ever since she left.

They put us behind the eight ball when they drafted that kid from Pacoima in the first round!
by thedzone September 24, 2009