Crusty is an adjective describing how someone is. Crusty: gross, smelly, rarely showers.
David: Hey bro, do you smell that?
John: Yeah.
(Both boys look to the side.)
David: UGH! She is crusty.
Describes something/someone disgusting
I know Jaelynn wants the D, but she's a crusty ass bitch so I ain't givin' it to her.
A thirsty boy who has participated in a loving wank with his right hand resulting in a sticky mess which is then not washed off for at least 2 days
That girl made him crusty, he be crusting over her all night long
A word to describe someone who is ratchet, grody, annoying or just gross. Peaches is the CEO of crusty.
Leshawna: Aye play Just Dance with me, hoe!
Harold: No.
Leshawna: FINE. You and your crusty ass can leave.