When you and your partner are in the middle of a ten hour F*%king Marathon and he says "here...here..hit this..." and hands you some sort of pipe and he says "don't waste it....." as he looks down at his penis, like somehow the smoke from your mouth is going to magically go into his body thru the tip of his dick thru the shaft;intrapeniously, into his who knows where ..........but regardless he's going to get more horny and turned on (whatever) So you do it anyways just to see what his reaction is or just to down right appease him while you laugh to yourself.

Tim: Zack, is that your exgirlfriend?
Zack: No, she's an expotential. We never actually dated...