a submissive, feminine male's orgasm achieved exclusively through anal stimulation, no hands, oral, nothing. This can be done with toys, (dildos, strap-ons, etc.) but most commonly involves a bigger, more dominant man brutally pounding the G-spot in the sissy's ass until they cum hands-free
After getting absolutely pounded by his hook-up for an hour, Alex had a sissygasm so large, it made his eyes roll into the back of his head. Now, he's not sure if he can ever go back
The act of uncontrollably laughing, or having a giggle fit, at something that could actually be funny, or possibly not. A haver of a sillygasm will convulse while laughing, grab on to things tightly, and can not be easily stopped, as if they were having an orgasmic experience.
Guy: The joke wasn't that funny, but she just started having a sillygasm, I think she was drunk...
When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).