(tr, adverb) slang to make important, prominent, or famous: we'll do our best to big you up
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
How to use big up in a sentence
Who are these Six Nations, whose name sounds so pow'ful big up here?The Scouts of the Valley | Joseph A. Altsheler
A big up-bound steamboat had run down and sunk a smaller boat of some kind.Raftmates | Kirk Munroe
But ye'll no forget her, and ye'll gar big up the auld wa's for her sake?Guy Mannering, or The Astrologer, Complete, Illustrated | Sir Walter Scott
Dey hab big fam'ly and dey live in a big wooden-beam house with a big up-stair'.Slave Narratives: a Folk History of Slavery in the United States From Interviews with Former Slaves. | Work Projects Administration
I guessed that you had something pretty big up your sleeve from your message.