A "roast" used by Roblox kids who can't roast.
Person 1 and Person 2 have an argument
Person 1: *comes up with a good roast*
Person 2: Shut up you crusty musty dusty rusty whatever
by Maxgamer345 July 13, 2023
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Someone who has never touched soap, doesn't know what a toothbrush is, and is usually a discord/reddit mod, or a snowflake keyboard warrior on twitter.
by Light Yagami aka Kira June 21, 2023
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a gen-z slang, used as an insult. may be used in any combination you like.
usually used by teenage girls to express how musty your ass is
how to use crusty musty dusty and rusty
"hi"
"get yo crusty musty ass out of my face"
"??..."
"you know what you did you rusty dusty-"
"SHUT UP YOU C R U S T Y M U S T Y D U S T Y R U S T Y A S S"
".."
by hellokityy? March 5, 2023
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inferior (rhyming with -usty, with the phonemes: /kr/ /m/ /d/ /g/ /r/.
Firey Speaker Box, BFDIA 7: "Don't come to me with that crusty musty dusty gusty rusty not at all trusty mess of a loser chamber."
by Sxanu Random Dude October 8, 2023
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MCRD (Short For Musty Crusty Rusty Dusty) Means Something That Is Expressing More Dirty And Unhygienic . This Slang Phrase Or Word Comes From People Who Are Part Of Funny Stuff On Social Media. MCRD Is Expected To Be Funny To Some People But The Rhymes Are The Job.
"you see this quite old innit yeah"

"of course bro its Musty Crusty Rusty Dusty"
"Hahahahhaha this joke never ends"
by Bleddy Drills January 11, 2021
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