The act of licking or sucking an asshole clean.
"Did you hear what John did to his boyfriend the other night? He was a total mud mouth! I just can't believe it.'
by Somthin Somthin March 03, 2011
mud mouth is obtained by taking a shitty dick straight from your ass into your mouth th finish a man off.
did u give her mud mouth? hell yeah i did, sh was a gooood girl
by gato September 11, 2003