1. Someone who is allways around and wants to be just like you. They swing from your nuts in atempt to follow your every move.
2. A piece of dry Duck butter or underwear lint stuck to your Sack.
1. Dude get the fuck away from me and quit swinging on my nuts you Nut Barnicle.
After having unprotected sex with a girl and you bust in her afterward you proceed to go down on her and attempt to suck the jizz from her box thus "cleaning her barnicle"
"Last night I had no rubbers but my girl said it was all good as long as I pull out i totally forgot so I had to give her a Barnicle Cleaner; it sucked my lips are still salty"