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1.
Something that is clearly not genuine, yet is passed off as such. Such statements or claims are bolstered with absurd credentials that are patently false and easily disproved.
I am a legitomite inventor. I invented chairs, clouds and the concept of irony. You can check my references with the Bureau of All Things Legitomite.
by met2art March 31, 2011
 
2.
fake

ripoff
It's legitomite art.
by reverendhotrod March 26, 2011
 
3.
A word used to express extreme badassery, maturity, sexiness and on occasion, holy penis size. Often used as a much more fantastic and meaningful synonym for dynomite.
CASE A
Person 1: Did you just have sex with three girls while playing YYZ by Rush on the drums, cooking pancakes and kicking Mike Tyson's ass?
Person 2: Suredizzle.
Person1: Legit-o-mite!

CASE B
Girl: Oh my gosh! He has a 9 inch penis! And it glows! It is so legit-o-mite!
by King of FUPA December 13, 2010