Definitions by shag master

insta-o 

When a woman orgasms because something was so great but no build up or sexual action was needed. Causes for an insta-o could be a hot guy, delicious food, or something just completely awesome.

Girl 1: Did you see that guitar player?
Girl 2: Yea, we made eye contact and had an insta-o.

insta-o by shag master August 29, 2010