Plunding is the act of putting an icicle in the urthra puncturing it. As blood pours out, it is then transferred into a cup with period blood and put in a smoothie.
Me and Sally were plunding the other day.
When a guy rams into his girl/boy friends ass with his penis as hard as he can.
Mark:Did you have fun lastnight mary?
Mary:Yes, it was the greatest ass-plund ever!
Mark:Good, would you like to do it again tonight?