I'm your wingman

I was watching a movie today. The buddy said to the main character, "I'm your wingman." Meaning "I've got your back." From Merriam-Webster:

Wingman -- Main Entry: wing·man
Pronunciation: -m&n
Function: noun

a pilot who flies behind and outside the leader of a flying formation

A recent Bud/Miller/Coors beer commercial was themed "Here's to the Wingman". The Wingman in this case is the guy in a pick-up bar who takes the ugly chick so his buddy can get to her friend, who's hot.