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1.
A term used by fans, (most notably female fans,) of avant-garde singer, songwriter, and multi-instumentalist Beck Hansen. It's most commonly used in the context of seeing Beck in a suggestive performance or video, photos of him, or hearing his voice, as it describes the feeling users of the word get when exposed to these.
"Beck's performance of Debra at the vh1 Fashion awards gave me a total beckgasm!"
by the new pollution August 01, 2006
 
2.
A term coined by the female fans of music and art extraordinaire, Beck Hansen. It is the orgasmic feeling that comes as a result of listening to or seeing Beck. This is ususally experienced by women, and occasionally men. The physical affects are sweating, heavy breathing, uncontrolable giggles, and a sense of extreme joy.
After watching Beck perform on TV last night I had a major Beckgasm!
by N/A/27 August 01, 2006
 
3.
Slang, derisive nickname for grandiose rallies heavily promoted and hosted by Fox News megalomaniac, Glenn Beck, where he invites hordes of Teabaggers to come as he shoots loads of generic platitudes upon them
The first Beckgasm, also known as Whitestock, was held on the same anniversary date and location of Martin Luther King Jr.'s "I Have a Dream" speech in front of the Lincoln Memorial in Washington, D.C.

The next Beckgasm will occur just as soon as Glenn Beck comes up with another aspect of American history that he needs to "take back" for white people—possibly the anniversary of the Emancipation Proclamation.
by RichardStabbone August 29, 2010