Definitions by Wozzzzzzy

goo knuckle 

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.

goo knuckle by Wozzzzzzy October 8, 2009