Mastercaking 

Master bating while eating cake

Slinging your meat while eating cake is mastercaking

Mastercaking by Dk25 May 11, 2013

Mastervaping 

The act of masterbating while vaping. Expert Mastervapers will ejaculate through Os.

Justin enjoys expert Mastervaping

Mastervaping by JoGael Piel August 20, 2016

Masterdating 

When a person (typically a guy) goes out to see a movie, or visits a theme park, or place otherwise mostly occupied by couples or friends,but does this alone. This can cause sympathy from other people that watch them as they purchase tickets or enter the area. This is different from when a person grabs a cup of coffee, or sits in a coffee shop alone for a few minutes, or rents a movie, or eats fast food. Masterdating involves often going to a restaurant alone, and sitting at the table alone, while some people look and either feel bad, or think that the person is a looser, or going to see a movie alone. It is often done by older men that may be widowed, or by people that can't get a girlfriend, or are the "40 year old virgin" type

You: 4 tickets for (name of movie) please
Masterdater behind you: 1 ticket for (name of movie) please

You (thinking) awe, he's alone, i guess he's Masterdating.

Masterdating by titagula December 12, 2010

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

mastercrying 

The act of crying and masterbating simultaneously.

I am a lonely loser, every night you will find me in my room mastercrying myself to sleep.

mastercrying by ChiChi1984 November 6, 2011

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