The man is flat on his back and the women straddles him and rides him up and down, up and down... Preferably facing forward, the women is riding / posting him.
Stands for "Pretty Obvious Sexual Tension Involving Nasty Girl". "Nasty" can also mean Nice, New, Nefarious, or Neat. "Girl" can also be subbed for Guy. When, during a social encounter, there's a clear mutual attraction and desire for sexual intimacy that is never consummated.
"Dude, I should be banging right now because I was straight POSTING at that party"
A traditional execution method where a person is lifted onto a sharp stake in the ground and impaled rectally. The body weight slowly causes the person to be further impaled until a vital organ is reached, causing death.
When an internet user makes a political post with his caps lock left on. Usually regarding support for Israel, dog breeds, Reaganomics, or distain for millennials or ethnic minorities.