Abbreviation for "penis knockout"; not unlike "TKO" in martial arts. Used if a man's sexual partner passes out right after sex, or when a man or woman is hit in the private parts.

Large, beautiful breasts that are keep well consealed and initially appear to be much smaller and less impressive than they actually are until unleashed.

Pussy Knockout.
A term used to acknowledge the utter defeat and mastery of a woman's vagina by its opposing penis. Similar to the "knockout" used in the beautiful sport of MMA, victory in the war-zone that is a bed (or anywhere else you choose to do the deed) can be obtained by mutual submission (aka: exhaustion) or by a PKO.

Characteristics of PKO include, but are not limited to: female's inability to take in more thrusts; massive vaginal cum; female loses consciousnesses; muscle spasms in vaginal area and upper thighs, etc...

The act of having sex with a women pulling out then slamming your elbow into her vagina