"Chocolate Peanut Bush" is a slang term for Hemorrhoids, which are also known as "Piles" and sometimes more commonly as "Bum Grapes".
It's generally used by those blessed with nice, normal arseholes to mock those that have guts that are literally trying to escape out of the back door.
Jim: "Blimey! I just had a check around my arsehole and my Chocolate Peanut Bush is in full bloom... Have you got one of those donut shaped cushions I can sit on?"
Bill: "You're not sitting on any of my chairs you filthy, Chocolate Peanut Bush growing bastard... special cushion or not!"
In the bedroom: Her vagina is the "peanut butter" whereas her anus is the "chocolate". It is fine to get some peanut butter in her chocolate but not the other way around. "Chocolate in the peanut butter" is this unfortunate state.
Usage outside of the bedroom:
Computer programmers may exclaim this when they mix up the binding of their duck-typed variables with incompatible variables for an unfortunate result.
"Oh no, I got chocolate in the peanut butter."
(said in front of co-workers in which whom only have experienced the bedroom version) "Oops, did I just say that?"
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.