To have sex with a woman, usually while intoxicated. Used as a noun, naming a location where only a select few guys go after a party. To achieve top gun status, vaginal penetration must be made. All other sexual acts count merely as "flight school" which in time may lead to top gun status.
Ace: Hey man, did you wind up hooking up with that chick from the party last night?
Rellie: Hell yeah man! I went all the way to top gun!