The phrase comes from Brazilian internet slang, where cabra is a casual word for a guy and merda dessa points to something worthless being shared. The full line heard in the clip is Como o cabra posta uma merda dessa, a rhetorical complaint rather than a real question. Because the exact original recording is unclear, the sound survives mainly through reposts, soundboards and short reaction edits. Its appeal is the instant recognition: Portuguese speakers understand the insult immediately, and even other viewers read the exasperated tone as disbelief at low quality content.