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1.
noun,

1.) an aged testicle, typicaly shaven, wrinkled, and boasts a very venicular look

2.) a uni-nut.
Rita: I gave him a blow job last night and his goo knuckles were slapping me in the face.
by Wozzzzzzy October 07, 2009

Words related to goo knuckle

ball dick goat nut testicle