Speak to a man about a Cadillac Share definition Flag Another alternate phrase meaning going to take a piss, uttered to a friend in a bar. Man 1: I'm going to speak to a man about a Cadillac. Man 2: Cool, I'll order us another round. Speak to a man about a Cadillac by Smokin' Bitch Magnet February 4, 2006 0 0 Get merch Get the Speak to a man about a Cadillac mug. Buy Now — $32.95 See more merch