Big up Definition 1 of 2Pro Tip 1/3Colloquial Cheers Often used informally among friends to show support or congratulate. Big up to you for nailing the interview! Pro Tip 2/3Urban Influence Rooted in urban culture, it's associated with music scenes, especially reggae and hip-hop. Big up to the DJ spinning the freshest tracks all night! Pro Tip 3/3Casual Recognition Not appropriate for formal recognition; keep it for casual, personal accolades. Let me big up my mate for helping me move.