The abbreviation style — clipping a heavy phrase into something that sounds like a juice cleanse — is the joke. Scheduling a "quick menty b" between meetings, or captioning a messy-room video "the menty b is menty b-ing," converts stress into shareable comedy.
Like much mental-health-adjacent slang, it draws mixed reactions: most use it as harmless venting, while some argue it trivializes actual breakdowns. In practice it occupies the same register as "I'm losing it" — hyperbole about ordinary overwhelm, common in work humor, student content, and parenting videos.