To sit idly and think.
"That is a lot of money. I will have to musterbate for a while before I make a descision."
by Shake Zula May 10, 2005
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(v.) To stimulate oneself or one's partner to the point of ejaculation of mustard.
Oh prease, it's time I musterbate in the bathroom, with the lotion
by TheLoudestFan October 27, 2008
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A term coined by Albert Ellis to describe the tendency to think that certain things "must" occur or "must" be done.

Other forms: musterbate, musterbated, musterbating
Janice was musterbating about getting an A in every course.

The only acceptable musterbation is to believe that one must not musterbate.
by TheLastPunslinger May 13, 2005
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(verb) To think you "must" do something without any choice when in all reality you have the choice to do or not do it.
"I musterbate about having to go to work to be able to pay my light bill."
by Che39 October 5, 2011
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