When something sticks to something using suction.
"When my dog sat on my face her butt plungered to my cheek"
When having anal sex with someone and instead of ejaculating you pee. Resembling a pump up water rocket.
My girlfriend told me to pound her fartbox and I slipped her the rocket plunger
The act of pleasing you partner with a plunger; either the handle portion or the rubber suction cup.
Yo I was using my pleasure plunger on my girl last night. Girl so damn freaky she broke the rubber part.