When something is just so fabulously awesome that you don't even believe it so you cannot just use "legit" or "literal." It adds emphasis and provides a WOW factor.
"Wow dude! Are you being legiteral?"
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When you penetrate someone's mother (or mother in law). This comes in handy when saying mutiple words is tiring.
Bro I'm so tired. I peneturmom last night. Deep.