Shoot from the Hip

When a man ejaculates out of his non-erect penis

I think I'm about to cum...
But you're still soft?
Yeah, I'm going to shoot from the hip

The Holy Shit

When, due to a combination of excessive horniness and constipation, one spontaneously ejaculates (for a man while still soft, see shooting from the hip) during an especially strenuous attempt to excrete.

Friend 1: Dude I'm worried that mac and cheese is going to cause me to take The Holy Shit
Friend 2: Oh god, why would your lactose intolerant ass eat dairy mid-November, it's a recipe for disaster