UBAT Share definition Flag User Being a Twat (UBAT) Acroynm for a computer user being completely stupid. 'That call was from John in HR. He said his monitor wasn't working, so I asked if it was switched on. It wasnt! Bloody UBAT!' UBAT by Tanktastic Techie January 8, 2009 0 0 Get merch Get the UBAT mug. Buy Now — $32.95 See more merch