What one says to another to shut them up from lying,
double talk, dancing around an issue,
bullsh*
tting them, etc. It lets one know you're not going along with or buying what they're saying and/or that you want them to tell the truth, get to the point, shoot straight in the conversation or confrontation.
"Where's my money,
Marv?"
"Yo, hey, I've been meaning to call you, something came up, and I, uh..."
"
Cut the crap, douchebag, where's my money?!?"
"Whatever, Crystal,
cut the crap, you spent the child support on a f*ckin' dress for the club!
The judge will love to hear that!"