y'idiot is short form for "you idiot", and if you say "yuh idiot" really fast, it becomes "y'idiot".
2+3 isn't 6, it's 5 y'idiot.
by timoko mikoto January 22, 2012
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1) Short for "you idiot"
2) Is a type of scrotum where the pubic hair curls while it hangs down very low (approximately 40cm)
Fady: I used a piece of crap as toothpaste this morning
Jesse:Y'idiot!

Nicole: My horse's balls hang down really low and are freakishly curly!
Kelsey: AHAHAHAH!It must have a y'idiot!
by Rhysinator February 6, 2008
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