The collection of cum on the bottom of one's feet after jerking off in the shower.
I dropped such a huge load in the shower last night that I don't think all of it went down the drain; I am pretty sure that I had some cum barnacles.
by urbancocktionary December 14, 2011
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The result of dried cum growing up into an actual creature, but is immobile
JIMMY: Why can't you clean your screen off? It's so dirty.
SEAN: The cum barnacles bite me whenever i try to clean it. Really fucking annoying.
by Afawoopster March 6, 2019
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