The phrase comes from Brazilian Portuguese slang, where escroto is a crude insult for someone acting like a scumbag or jerk. Clips with this exact wording circulate mainly as short WhatsApp style voice notes and soundboard buttons rather than from a known film or show. Its popularity comes from the specific name Guilherme, which makes the shout feel personal even when reused for anyone. Brazilian creators keep sharing it in meme edits, gaming chats and reaction videos, where naming and shaming a friend is part of the joke.