On flop

Being so sure you're correct that you're willing to bet being forever flaccid on it

"Wha' say you bruv, I heard you lipsed my gyal behind my back at the club last night"
"Nahhh I didn't man, on flop I could never do that to you"

"There's no way you sank a three pointer from the half-court line"
"Yeah man I do it all the time"
"On flop?"
"Yeah on flop"