Comma Bill Share definition Flag A bill at a restaurant, bar or other establishment that is so big it has a comma in it. (example: Anything above $1,000) Damn dude... I spent so much at the bar last night, I had a comma bill. Comma Bill by mrbadss January 21, 2008 0 0 Get merch Get the Comma Bill mug. Buy Now — $32.95 See more merch