It is when you have sex with your partner in the "pile driver" AKA Halasana yoga pose. When it is time for the man to cum, he pulls out and shoots his cum down onto the woman and straight down onto her face.
My girlfriend loves her yoga positions. There was a time when I had her in the Halasana position, and when I was about to cum, I pulled my cock out from her pussy and shot my load down onto her inverted body and face. I looked down at her inverted body, her pussy up in the air with her legs spread wide, and her face totally covered with my cum. She smiled and stated "I love that position, and now with all the hot cum, it was the perfect Halasana money shot".
When a girl lends her hand(s) to a guy and right as he is about to Cum she aims his Dick towards his face and splattering his face with his own Cum as she yells boom head shot.
When he spends too much time on FPS games you find a way to boom head shot him.
Like a pickle back shot(shot of Jameson with a chaser of pickle juice), but instead of pickle juice, use jalapeno juice. A beautiful waitress came up with this shot and it was named after her!