1 big up Rate this phrase:(3.00 / 1 vote)
To increase one's muscle mass through exercise.

He works out every day to big up himself.

2 big up Rate this phrase:(0.00 / 0 votes)
To proclaim or exaggerate the importance of.

They're trying to big themselves up to be more than they are.

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"big up." Phrases.net. STANDS4 LLC, 2018. Web. 21 Sep. 2018. <https://www.phrases.net/idioms/big-up>.

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