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Crusty Musty Dusty Rusty

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

Ugly crusty musty dusty bitch 

Something you say to a ugly person (me)

crusty musty dusty flusty 

someone who is crusty musty dusty flusty, is a person who is literally so weird and disgusting and quite revolting.
Ew look at that crusty musty dusty flusty lookin ass bitch over there tf?

Crusty Musty Dusty Rusty

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.

crusty musty dusty toes 

The very delishable food
crusty musty dusty toes by OOGA MAN November 17, 2022

crusty musty dusty gusty rusty 

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."