I'd poop on that.
You use it when you think someone is so hot you'd let them poop on you during sex.
She said, 'I'd poop on that,' after I told her I'd let her poop on me.
He said, 'I'd poop on that,' when his ex walked into the room.
At the party, I said, 'I'd poop on that,' and no one knew what I meant.