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"
".."
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.