Top Definition
A person or generally a boy usually just had his 18th birthday thinks that he has what it takes to run shit in the adult world, but in reality he's just a "lil big boy" who will soon findout how much growning up sucks.
"Skyler, your a little big boy!"

"No I am not, what does that even mean"

"Well your still a lil-bit-boi-jr.!"
by souffle dont play December 03, 2013
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