smart motherfucker 

Someone, who knows about the metric system while eating hamburger

-You know what they call a Quarter Pounder with cheese in France?
-A Royale with cheese.
-A Royale with cheese! You know why they call it that?
-Because of the metric system?
-Check out the big brain on Brett! You're a smart motherfucker!

smart motherfucker by dildo777 June 26, 2021

Smart Ass Mother Fucker 

Very similar to Bad Ass Mother Fucker only instead of being a Bad Ass your a Smart Ass (and not a bad kind of smart ass).

guy 1 "John can do particle nuclear physics in his head while high!"

guy 2 " Yeah John is one Smart Ass Mother Fucker"

Smart Ass Mother Fucker by Jesus37295 December 31, 2009

smart ass mother fucker 

Someone who is acting like a gay smartass.

Joe: It looks like he is saying kiss me kiss me.

Chris: Smart Ass mother fucker.

smart ass mother fucker by the cool Ratman April 10, 2007