The line comes from the Netflix animated series Captain Underpants, where the grumpy school principal Mr. Krupp is a central character and frequent source of exasperated outbursts. In the show, fire in the hole is used as a comedic warning before something messy or embarrassing happens, which fits the series' toilet humour and schoolyard tone. Fans clipped the short shout for soundboards because it is easy to recognise, works out of context, and pairs naturally with fart jokes and prank edits online.