"Shit, I was really hopin to tap that ass"
"And don't even think about kieling that shit either"
This is closely related to the more general phrase: to call a bluff.
He said he'd strip and streak through the championship football game for a hundred bucks. I didn't think he'd really do it so I put my money on the table and called his bluff. He lost his shirt and the rest of his clothes. And I lost $100.
See also on call.
Medical Student 2: Nah dawg...I have call tonight.