Top definition
The noun that occurs when ones penis/boner becomes so encrusted with smegma and fromunda cheese that it is no longer recognizable as a human penis

Also the noun that occurs when having anal or vaginal sex with a women, but after cumming, not pulling out until your penis has been encrusted into the hole and is irremovable
Guy: alright are you ready for this *whips it out*
Girl: OH MY FUCKING GOD YOU TOTES HAVE A FUCKING CRUST-BONE!!! IM TWEETING THIS

Dude 1: *talking on phone with friend* hey man we had an amazing night, but I can't hang today...
Dude 2: wtf man why not?
Dude 1: I didn't pull out and we fell asleep so now I got a crust-bone
Dude 2: oh... That sucks...
by Darnman April 09, 2015
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