derf

(Definition 1): The extra skin that allows your balls to swing out, so you don't shit on them. (Although usually covered in hair, there have been reports of hairless and albino derf spottings in the wild);
(Definition 2): sweaty, stinky, beneath you, Flappy Fringered Bassist

(Definition 1): This Guy I know was in a bad car accident and broke his derf. Doctor told him it might never be the same.
(Definition 2): That guy they caught spanking it in the Mens room is such a Derf.

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