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Crayday means crazy day. Simple as that.
Cray - Short for Crazy and just add the Day at the end.
Person 1: Dude, we just ran from cops yesterday because we was paranoid and we vandalized the walls.
Person 2: Daaaang, you guys must've had a Crayday yesterday!!
Crayday by HawaiianIslands January 8, 2012
Related Words

Crazydan 

"You're so cheap, you're Crazydan!"
Crazydan by Anonymous October 7, 2003

crazydave 

crazydave is what you call someone who rejects being korean (although is CLEARLY korean) and also is a big faggot.
"Hey dude, have you seen Mike recently?"
"Yeah man, hes such a crazydave!"
crazydave by Youssef Mtnak August 26, 2021

crazydavepensi 

crazydavepensi penis
crazydavepensi by brokkenmatter March 21, 2021

Crazydino 

Typically the gamer name for a generally short chubby kid normally with toddler like features who is far over due to go frough puberty and is normally quiet and anti social, and never leaves his room to play video games all day
Shush crazydino you midget
Crazydino by shmucky joshuar September 13, 2021
Behaviour that is more deliberately humorous that demented.
Ooh, there he goes with that crazydy behaviour again.
crazydy by Hercolena Oliver March 31, 2009