Big'n'Nasty 

Big'n'Nasy describes the act of cumming into a womans, or mans mouth then proceeding to shit in their mouth also. After this, you make-out with the person with the cum/shit mixture and swap back and forth swallowing a little of the matter each time until it's entirely gone. Similar to snowballing

Guy1: Dude...I did a Big'n'Nasty with Victoria last night.
Guy2: Yea, I can tell...I can smell the shit on your breath.

Big'n'Nasty by gunut09 March 7, 2009

Big N' Nasty

1. A more appropriate term for the Big N' Tasty.

Hello, welcome to McDonald's, would you like try a Big N'Nast...OOPS!! I meant to say, Big N' Tasty???

Big N' Nasty by Aqueas January 20, 2004

Big n' Nasty

goin to Macdonalds and gettin the big and tasty

Yo lets go hit up the Big n' Nasty

Big n' Nasty by golf team November 15, 2005

BigNnasty 

another variation of BigNasty refers to a Big-N-Tasty for McDonald's describes a large person who doesn't seem to know they are large because (s)he wears too little clothes.

"Keva! Did you see BigNnasty at the dance?
No! Thank goodness i heard she looked big and nasty!"

BigNnasty by asmore April 13, 2009