Colloquial term in South Africa, used to describe the act of fornication with a jar of peanut butter whilst being stung by a bee. Often times the person will first be stung by a bee and then feel the sudden urge to stick their penis into a jar of peanut butter.
Daniel: I heard you were stung by a bee, are you alright?
Stephanus: Yes I am, I did a Dirty Gerrit to help calm my nerves.
Daniel: Oh, that's always the best way to deal with bee stings.