The phrase pulls from sus, the slang shortened from suspicious that exploded online with Among Us in 2020, combined with bruh as a casual meme sign-off. Clips using lines like this spread on TikTok, Discord soundboards, and YouTube Shorts as a reaction to anything that looks guilty. It does not come from one confirmed movie or show, but lives as a generic voice meme that creators reuse whenever a moment needs an obviously fake claim of innocence.