Used to describe someone or something that is generally bad or unattractive. Can also be used as just a noun("crust"). If you wish to use crusty in a neutral way, say "crunchy"--- for a good way say "crispy". Use crusty with rhyming words to emphasize a point.
"OMG this ugly hoe just cut in front of me in the McDonalds line... crustyyyyyy. "
"Boi, get you and yo crusty, dusty, musty Crocs outta here!"
a term to describe a person who has crusty moves or a crusty personality. crusty can mean being negative, doing the most, or just being weird in a bad way.
you flirt with every nigga and you don't even have a phone. you're crusty.
wow, you're literally being extra right now, hella crusty.