Inoperative; broken. The term is also used to mean fallen over on one's back. This is a 20th century phrase, probably of military origin.
A play on the phrase "go belly up. Sorry, Mark, I'd love to give you a lift to the airport but my car's gone tits up on me again. It looks like our co-op might be going tits-up if we aren't granted a license for our communal work premises. We were all set to have our picnic on Saturday, but the weather went tits up and we had to cancel at the last minute. The merger deal between the two companies went tits-up when it came to light that one of the CEOs had been dodging tax obligations for several years. A play on go belly up which has the same meaning.
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Top definition. Its gone tits up meaning its gone wrong, its not working. Inoperational, regardless of the reason, on either a temporary or permanent basis. My cell phone battery is almost titsup, and I left my charger at home. His cell phone was titsup after his ex tossed it into the hot tub.