Pooping their pants - Idioms by The Free Dictionary
poop (one's) pants (redirected from pooping their pants)
poop (one's) pants
1. Literally, to defecate while still wearing one's pants. I need you to pull over the car right now, or else I'm going to poop my pants!
2. By extension, to be very surprised. When I saw that the magazine had published my letter to the editor, I totally pooped my pants!
References in periodicals archive
Brzezinski couldn't stop herself and said: "Like a kid pooping their pants and then saying I meant to do that
It would be like somebody pooping their pants and then people looking at it and saying 'oh that's modern art don't you understand.