A burger with peanut butter on it that can be eaten or used to describe the way female genitalia may look or feel after a long, rigorous night of intercourse.
"How did it go last night?"
"Man we banged all night long! I had her lookin' like a peanut butterburger down there!"
When you lube up your asshole with peanut butter (chunky if preferred) and a dick or dildo with unspecified jam or jelly and fuck the asshole and then suck mixture the dick or dildo.