The echolocation tool men use when they piss
in the dark to make sure they're hitting the toilet. This involves starting to urinate and
listening carefully for the sound of the urine stream hitting the
toilet water. If the sound is not heard, aiming adjustments are made until such time as the reassuring sound is heard.
Joe: "Man, I got home last
night drunk, went in
the bathroom, didn't turn on the light and ended up pissing all over the
bathroom floor."
Bob: "You should have used piss sonar to find the toilet, bro."
Joe: "Oh."