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4.
Adjective used to decribe old people,a gross unidentified substance, anything broken, dirty, crumby, badly made/conceived, falling apart, stupid, wierd, gross, this word can be used very freely as it goes with anything that may have to do with the word crust but it never describes anything good.
1: that old man keeps staring at me
2: eww look how crusty he is

-or-

1: i just got this from the dollar store and the lid wont close on it
2: here let me try... damn its not working it sooo crusty
1:that whole dollar store is crusty

-or-

1:Mr Tawil thinks he can teach us history by giving us a whole bunch of crosswords, he is such a crust.
2:Yea, he smell like weed, cigarettes and bagels, he is such a crusty old man.

-or-
1:ew look at the crust under this desk
2: that's gum , you dumbass
by Naomiiiiii January 16, 2007
 
15.
When you just wake up and you're about to show the world your natural beauty. It's when you full on have crust in you eyes or the white crusty stuff on your lips and you basically look like a hot mess.
Amy, I'm soooo crusty on campus right now. Wearing the sweats and the greasy hair, I truly can't get crustier than this!
by jblooo February 20, 2014
 
16.
Crusty means Sketchy or dangerous. It can mean not very well made or poorly constructed. It can also be used by saying something is not healthy.
I don't want to walk across that dock man, its pretty crusty.

(looking at the poorly constructed building)

Man: That's crusty...
by DillOlive September 30, 2011
 
17.
A group of 4 or more bums.
I got hit up by an entire crusty of bums. Now I'm broke and out of cigarettes. Next time I'll avoid the crusty.
by junethug December 31, 2009
 
18.
the gunk that forms in the corners of your lips after drinking a bottle of gatorade
No one said anything, so Billy played the whole game with red crustys on his face
by footballfiend5 February 07, 2009
 
19.
One who resides in the state of Pennsylvania and smokes a lot of marijuana.

it can also be used as a verb "getting crusty"
Hey man, wanna get crusty today?

Hell yeah, you got your bong?
by i bet youre a whore January 29, 2009
 
20.
noun ; when you see something that is disgusting
My teacher looks so crusty today..
by angel flowers March 07, 2014
 
21.
the feeling the morning after a long night of heavy drinking
being dehydrated and hungover
the general feeling of crust
Spongebob and Patrick Star dried up on the beach aka they're crusty
by ayquela February 25, 2014