The act of accidentally seeing a person of the opposite sex partly or fully naked immediately before you enter their space for some legit purpose.
Airline Passenger: Judd, guess what! I got a perview of that hot spanish flight safety attendant because she fogot to slide the bolt to "occupado" while on the john. I was walking in to take a piss and saw her taking a t.p. tour of Forrest Gump, yo!!
Happens all the time to meter readers and letter carriers.
The telltale impact sound created the moment a gaping vagina is skewered by hastily inserted man meat. The queef before the queef.
Roommate 1: "Did Becky get a salad last night at Chili's."
Roommate 2: "Dunno, but for dessert she brought Danny home for a clam dunk; I heard it through the wall even before her shoes hit the ground, yo!"