It's the old dried poop stain in your britches or on your ass that flakes off onto the toilet seat when you drop and squat.
Dude, you better use the other bathroom- Paulie just left crusties all over the seat.
by Tommy and Jim April 15, 2011
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A word to describe basically anything bad about anything.

Origins in Ohio from a group of teenagers complaining about a ton of stuff, and forming a very exclusive group called "crust gang"
Person 1: This school is so bad..\
Person 2: Yeah its crusty
by cruster duster December 2, 2019
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A hand rolled cigarette and/or spliff/joint consisting of the discarded remnants of cigarette butts/roaches.
I'm so poor I had to raid the ashtray to roll a crusty.

I just cleaned my room and found enough spliff roaches to roll a crusty.
by doodad June 5, 2015
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The most fantastic versitile word in the world, can be used to describe something that is actually crusty and disgusting, as well as fantastic things that are so amazing and crustacular
"ewww that pile of dirty dishes in the sink is soooo crusty"
"wow we need to clean, our house is geting crusty"

"OMG I LOVE YOU CRUSTY GIRL!"
"you are the crustiest person i know!"
by doggiestyle23 August 27, 2009
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Semi abusive discription of a traveler, Or a Wannnabe. Part of the New Agers, with their own music, Dress Sense, Lifestyle. opted out of mainstream society in the mid to late 80's traveling from place to place with the unforgetable dog-on-a-string acssory.
frist seen in the media in the 1985 battle of the beanfield. (UK)dispised by most of society including (and not to be confused with) Gypsies, Pykies, showmen, and tramps.
The 1994 Criminal Justice and Public Order Act included legislation against their lifstyle.
The remaining one's get hounded by teenages, on the lookout for somene who might be able to spare/sell them Dope
The common Cry of: "Get That Fucking Dog Out of Here and Go With It You Crusty Get!" in between Glastonbery and Bristol Before the Summer Solstace.
by Marcus Gravy March 26, 2007
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Undercloths that have been soaked with sperm either from repeated coitus(not likely) or self masturbation (oh yeah)
Dang Jim you better lay off the pipe. Your crustys are getting rank!
by Rightous Willy January 31, 2004
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A word often used at Pontiac Township High school:
To describe a lower class person, (Offensive) Someone who can't afford (Or just doesn't want to look like a TOOL) Aeropostal, and or Abercrombie, Hollister ect. Someone who looks as if they never bathe.

Someone who you assume smells, although you're always dodging them in the hallway for fear that your nostrils will fill with their putrid sent.

A word created by people who are, for lack of a better word, insecure about themselves.
"Oh, dude. That chick is so crusty!"
"Why? Just because she can't afford douchebag clothes like you?"
"Exactly."
--
"That's crusty."
--
by Michael Pottttts February 17, 2011
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