To enlarge the volume of a substance, thereby increasing the profit when selling such product. Mostly used by lower level drug dealers, employing fiends who cut up coke, increasing the volume of a batch by a certain percentage. An increase in volume without increasing the amount of basic substances leaves you with an inferior product.
Antoine: Aiyo, i got this horrendous nose bleed last night from the white Dukie i got up on 53'rd street.
Peshawar: Man, i told you not to get that stuff from uptown, they always big it up. You should visit my Jamaican friends down south for some crystal clear premium grade stuff.
Antoine: Aight man, hook me up for tonight.
by Frituurmeister February 6, 2011
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1.To 'live large'. To party hard, and basically live for thrills and excitement. Commonly used by grimies/indie kids/ravers in Australia and some parts of the UK.

2.A word associated with a barely recognized music genre/label, grindie rave core, mixing grime, indie and rave. Most common grindie rave core band would probably be Hadouken!
1.Azza:Rave tonight at Bevva's courtyard?!
Deegan:Fuck yes. Big it up for real.

2.Deegan:Man, Hadouken! is the basis of grindie rave core!
Azza:Yer mate. Big it up!
by Azza. January 7, 2008
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a trixie-ism.
to exagerate, and/or make it up.
pam's birthday party was so lame she had to big it up by saying that keanu was two tables over, and partied with the party. (not!) because keanu would never be caught dead at a ballwash place like remy's.
by trixie g. February 17, 2005
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Congratulate yourself; "Big up yourself" is also acceptable.

You can also "Big up" someone else.
by Rath May 25, 2003
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1. v. i. to come through in the clutch
2. v. i. to make an amazing play. also come up huge
3. v. i. to succeed, to come out ahead. antonym: come up short
1. Shaq came up big for the Lakers in the 4th period last night.
2. Shaq came up big on that backwards alleyoop dunk and then said, "don't fake the funk on a nasty dunk."
3. The company came up big for the quarter and ended up with a net profit.
by fizzle April 11, 2004
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Ruin a chance completely. Did something very regrettable. Possible consequences: intense self-hate, suicide, depression etc.
'You cheated on your boyfriend for the sixth time?'
'Yeah, it was his best friend actually.'
'You fucked up big time!'
by dphn00 January 1, 2012
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