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The act - either planned or unplanned - of falling to sleep after masturbating.
I was just going to rub one out, but I ended up masternapping for an hour.

Bob's been away from his wife for two days, so he went upstairs for a masternap.
masternap by ScottNWDC June 9, 2011
Word of the Day on September 19, 2011

masterbatorium 

A confined space used for masterbation. A masterbatorium will sometimes have pictures of naked bodies hanging on the walls for visual stimulation. Those little rooms in the porn store that you stick quarters in, those are masterbatoriums. A masterbatorium will generally smell of lotion or crusted semen. You get a feeling of filth when you walk into a masterbatorium.
The guy who lived below me had his room completely wallpapered with centerfolds of Playboy Playmates, this was obviosly a masterbatorium.
masterbatorium by Russ Buss April 8, 2006

Masterboy 

A german eurodance group very popular in 90's in Europe, Oceania and South America.
Masterboy marks the end of good dance music. All things released after 1995 of this genre sucks afterall.
Masterboy by Phair May 21, 2006

masterbooping 

When you take a dump and jerk off at the same time.
"damn, that brey chick is hot. But i gotta take a shit. I'm gonna go masteboop.

"mark's mom caught him masterbooping. He was covered in feces and semen."
masterbooping by cuminmybutt January 12, 2008

masterbacon

The act of masturbating during or after the consumption of delicious bacon (the candy bar of meats)
I can't believe Johnny got kicked out of Bob Evans for masterbacon at the table
masterbacon by smell my fingers October 12, 2011

masterbatory scheming 

The act of plotting secret masturbation acts from those around you or living with you.

"Little Billy is the master of masterbatory scheming, his parents thinks he likes being clean and showers five times a day"
"Little Billy is the master of masterbatory scheming, his parents thinks he likes being clean and showers five times a day"
masterbatory scheming by Hylindar September 2, 2014