The "tongue to object" manuever used when checking a 9 volt battery with your tongue.
Going down on a girl for the first time? Use the 9 volt test
Mike: I took that rolly-polly lookin chick home from the bar last night.
Joe: Oh yeah? How'd that go?
Mike: She kept doin the pelvic tilt head push tryin to get me to eat it.
Joe: Did you?
Mike: I wasn't sure if I should or not, so I gave her the 9 volt test.. I had the same reaction you get with a battery.
Joe: Grossdug eatin' beans whippet breaves midnight roast hog spit egg sandwitch