yuccky; repulsive; specifically, having unremoved dried secretions/excresences on oneself or scabbed-over pimples/sores. More generally, dirty, disgusting.
Eww, his handkerchiefs (shorts, sox, etc.) are as crusty as the 6-months old pudding in the fridge.
when you do not wipe your ass for a month them pour lotion in your ass crack and let it sit for a week. this causes a crust that needs a jackhammer to remove it is so thick and hard
after that shit i didnt wipe and now i have ass crust