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1.
Adjective: When something is awesome enough to be judged "real big" by one or more observers. Can apply to an action, an item of clothing, a house, a car, or anything else deemed fly.
Homie #1: Damn, dude, check his Benz. He's got gold 24's and chrome hydraulics.

Homie #2: Shit. That's real big.
by D-tha M-B May 01, 2009
 
2.
To contradict the laws of physics by consuming more food in one sitting than should ever be possible.
You ate seven tacos, three burritos, four quesadillas, two pieces of pizza, five pieces of chicken, and still had room for nachos? You real big.
by koreiryuu August 25, 2009
 
3.
to act real big and were an and1 hat with real big stitched on the back
hey real big hows ur new and1 hat
by denman March 22, 2004