look up any word, like cleveland steamer:
 
1.
The act of when you have immediate sex with another person.
If there's a model on your car, insta-bang occurs.
by Dickless Mcghee March 09, 2011
 
2.
The act of obtaining the phone number of a female that you have never personally met, spitting game, and eventually meeting and having sexual intercourse with her. Some believe that this is much more satisfying than actually meeting someone and having a one night stand. It also makes for a great story.
Me: (sends picture of hot girl to friend)

Friend: who is that

Me: this chick I've been talking to that I'm going to hopefully instabang very soon.
by @meedy_baby follow April 26, 2014