Similar to “shooting in the dark” or “shooting from the hip”. When you guess at a particular subject with about as much accuracy as you would have using your penis.
Guy 1: How much did that countertop cost?
Guy 2: About $5,000.00
Guy 1: Are you sure?
Guy 2: I don’t know. I’m just shooting from the dick.
Another term for multiple premature ejaculations, generallyused as a sexual replacement for the phrase "shooting from the hip."
Alex: "Hey man, how was Stephanie last night?"
Eddy: "Horrible man, I was cumming from the dick and she got really mad. It's not like I could control it, I didn't even know we were going to have sex!"