This phrase comes from “Jizz in My Pants,” a comedy song by The Lonely Island that debuted as an SNL Digital Short in 2008. The track became widely quoted online because of its deadpan delivery and intentionally ridiculous premise. Short sound clips of the line spread through meme edits, reaction videos, and soundboards, where creators use it as a fast escalation gag. It stays popular because the joke is instantly understood and fits the same reaction-sound space as The Nut Button.