Repeatedly punching the testicles of a sexual partner for pleasure.
Tim:
I love when becky uses me like a speed bag.
Frank:
What?
Tim:
She gives the best mash jobs.
Keyboard mashed
Very useful to confusing friends into thinking you've had a stroke.
For example:
"Dude you ok? why'd you say that in chat"
"I Keyboard mashed"
Put a banana in a sock, mash it up and put it in microwave for 20seconds. When done put it over your penis and start masturbating.
(20 secs only so you dont burn your knob)
I'm going yo get home and have a mashed up monkey
"I am going to have roast beef & mashed potato tonight!" - Jack
"Okay wear protection" - Jake
When a person has a bowel movement while showering and proceeds to force it down the drain with his/her foot.
I could tell from her glistening brown toes that Ethel had done the monster mash this morning.
The act of absolutely thundercunting a bitch in her moose-knuckled lulu lemons.
Steve: Nancy was acting like a total bitch in class so I gave her the old fashioned Mooseknuckle Mash.
The Michigan Monster Mash happens once a year on Halloween night. It is a event where many people at a Halloween party get together in costumes and have a mass orgy. The best part of the Michigan Monster Mash is that everyone is in a costumes and no one knows who is who. So next Halloween go to a local part and do the mash ;)
The Michigan Monster Mash happened in Ann Arbor Michigan on Halloween night in 1999, and has happened ever year since.