When Something is so cheap and hilarious that it is described as bum- tastic. Usually used to describe good for nothings, slobs, and lazy assholes.
guy 1: Did you clean your room and brush your teeth today?
guy 2: No, I have a life you know!
guy 1: Thats bum-tastic!
guy 2: No, I have a life you know!
guy 1: Thats bum-tastic!
by NotABum October 20, 2009
Get the bum-tasticmug.