1. To defecate. To poop. To go number two. Deuce is a synonym for the number two.
2. To drop poop from your butt into a toilet or anywhere else.
3. On rare occasions it can be slang for throwing a curve-ball...but we know what it really means.
1. I'll be right back, I'm gonna go drop a deuce.
2. Timmy was passed out and we dared Mike to drop a deuce on his face...he didn't.