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.
"Man, she passed out right afterwards. It was an epic PKO."
"He PKO'ed me so hard, it hurt like hell."
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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...
"Wanna go home and get PKO'd, Lauren?"
"Don't ask, Carrie... after last night's PKO I will need minimum two week recovery time."
The act of having sex with a women pulling out then slamming your elbow into her vagina
Dude I pko’d that girl last nighy