When you fuck your cousin so hard her pussy falls out so you put some bread and mustard on it and eat her out.
Me: bro i ate a mississippi roast beef sandwich last night!
Friend: that sounds awesome, what is it?
Me: my cousin!
Friend: that sounds awesome, what is it?
Me: my cousin!
by bigboy992 March 29, 2021
Get the Mississippi roast beef sandwichmug.