Top definition

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
Get the mug
Get a goo knuckle mug for your daughter-in-law Sarah.