When the bath has been made too hot, and you must plunge your hand into the boiling water to get the plug out to make space for cold water
Why's your arm all red?
I had to plug plunge as I made the bath too hot
The act of intense intercourse, usually in the doggie position, where the male freefalls from a distance of 6 inches or greater into the female. Hence leaving feeling like "geronimo".
Last night that girl was so crazy, I had to give her the geronimo plunge just to satisfy her
The act of one person eating pineapple and then plunging their tongue into another’s anus
Bob: After I ate that bowl of pineapple, she asked for me to eat that ass
John: Awesome dude your first pineapple plunge!