random guy : Damn nigga your crusty
Dude:not as crusty ass that nigga Jacob
Random guy:damn you right
crusty's come's from the ass crack the stick to ya jocks.
doing a sloppy fart and it becomes hard and u have stained jocks and it dont feel good.
To be crusty or a crust is to be irrelevant like those useless pieces of bread crusts at the bottom of yur toaster.
Look at Jade,she has no friends, she is so crusty.