Best definition
White Shotgun
“lupara bianca” (white shotgun) is, in the lingo of the mafias in many countries such as Italy, a murder in

which the body is never found.

“Armando, we must use finesse. Make sure you bring the white shotgun.” or “Ana fears this may turn out to be another white shotgun case.”
White Shotgun: define #2
White Shotgun
When you take a magic marker and draw a target on her pussy and jizz at it like a gun.
“I gave my girlfriend a White Shotgun} last night and got a bullseye.”