The phrase is a dialect form of saying you are going for a pee, with pipi being a childish word used in German speaking areas for urinating. Clips like this circulate as short soundboard jokes because the meaning is clear from tone alone and the wording sounds innocent rather than rude. The toilet tags attached to this upload point to its use as a bathroom humour effect, shared in chats and edits where a blunt announcement gets a laugh without needing a longer setup or explanation.