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Wiktionary
big up

n. (context slang also '''big ups''' English) Significant respect or acclaim. vb. 1 (context British slang idiomatic English) To increase one's muscle mass through exercise. 2 (context Jamaica slang idiomatic English) To proclaim or exaggerate the importance of.

Wikipedia
Big Up (song)

"Big Up" is the fourth and final single from Jamaican reggae artist Shaggy's debut studio album, Pure Pleasure.

Big Up

Big Up may refer to:

  • Big Up (group), a Black gay men's group that merged with GMFA
  • "Big Up" (song), a song by Shaggy

Usage examples of "big up".

All right, I'll give you credit for having had another firecracker equally big up your sleeve.