Best definition
Similar to wingman but instead of guiding your friend’s cock, you swoop in before the deal is sealed and leave

with your friend’s intended target.

WTF dude–way to wingbang that fatty–I was totally going to hit that.
wingbang: define #2
wing bang
When you have sex with a girl your friend is into to find out what she likes in bed so he can look good the first time they sleep together.
Sure Jim, I’ll wing bang that girl from 4C for ya.