Manterboating

The placement of one's face, into the cleavage of a man's moobs, followed by the side-to-side shaking of the head accompanied with a motor-ing sound.

John made many trips to McDonalds on Friday; resulting in a hefty, yet delicious figure. Sarah was captivated by his rolls and decided manterboating his moobs at the pool the next day would be a hot idea.

Manterboating by D & L February 3, 2008

Mangerbating 

Angrily masturbating, masturbating while angry

Noun: mangurbation

Last night I was mangerbating

Mangerbating by Mish da bish May 9, 2014

masterbating with a cheese grater 

Doing a task that is not a good idea

Moving this piano without help is like masterbating with a cheese grater.

masterbating with a cheese grater by matt1975 September 10, 2012

masterbating 

Expertly jacking off.

Guy 1:Man, I think steve's masturbating again.
Guy 2: From the sound of it, he ain't just masturbating, he's MASTERbating.

masterbating by Sir Fizwheel Humperdink October 5, 2007

materboating

motorboating but with your friends(mates)
fun for groups!!!
try it with your gal pals today

ello barbara we’re avin a group wank and a good ol’ materboating. cum join us

materboating by eat out to help out January 1, 2023

stealth masterbating 

When one wacks off as quietly as possible so as to not disturb the people in the same room.

Sam: I hope no one notices I am stealth masterbating
Girl friend: Sam ... are you wacking off!!!!
Sam: Oh Shit!

stealth masterbating by themanwiththeplan9192 April 4, 2010

Masterbating Monkey 

A primate creature who masterbates.

"Monkey Masterbation Spotting" has become a hobby in the South American State of illinois. A well known competitor in the sport of of Monkey Masterbation Spotting is Fred Phelps, a very vocal and fanatically religeous biggot.

The monkey wrapped his primate hand around his primate pink penis, and masterbated furiously untill he fell out of his tree. Fred Phelps watched in glee as he photographed the event so he could show the pictures to his family.

Masterbating Monkey by Gordon Freeman October 31, 2004