In the drinking game "Kings," the Thumb Master is the player who is in charge of signalling when someone must drink. At any point during the game, the Thumb Master can put his thumb on the playing surface (table) or forehead. Everyone else must also do this, and the last person that does it has to drink. One is bequeathed this role when he pulls a 10 (or whichever card is deemed). The Thumb Master rules until the next person pulls a 10, in which the new person inherits the title.
I wasn't paying attention when the Thumb Master put his thumb on the table; therefore I had to drink!
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.
A narcissistic animated cup on the show Aqua Teen Hunger Force, or the newer, worse Aqua Unit Patrol Squad 1. He enjoys terrorizing meatwad, dressing up as super heroes, being a smart alec, and just conditioning himself w/ love. He can't help that he's so awesome.