Sigasm 

To experience an orgasm whilst having sex with a guy named "Simon".

"OMG i totally had a sigasm last night"

Sigasm by Sigasmic April 12, 2009

sighsmike activity 

Rumblings caused by the heavy sighs that eminate from a supervisor's (name should be Mike) area during his stressing out over employee productivity.

A: Sheesh, there seems to be a lot of "sighsmike activity" today.
B: Yeah, I know, I think the Ted-tonic plates shifted a little bit earlier. Be on the lookout for a Sue-nami!

sighsmike activity by Bryan Gilbreath August 28, 2009

Sagasm 

When a new concept, series of concepts, or the ensuing discussion of said concepts is so stimulating to the mind that one experiences a climactic mental state akin to the physical state of the orgasm; a mental orgasm. The experience is named for Carl Sagan, as it is through watching or reading his works that this experience is most commonly achieved.

I never knew the universe was so huge. Earth is just, like, a mote of dust, illuminated in a beam of sunlight, floating in the great cosmic ocean. Ooooh, oh man, I think I'm having a Sagasm!

Oh man, so amazing. It okay if I just fall asleep?

Sagasm by Harmonica John October 20, 2010

scigasm 

For the scientist, it is the intellectual pleasure that accompanies obtaining really cool f***ing data from an experiment.

Thad looked at the results from the western blot and had a scigasm.

scigasm by Hellboy1 January 14, 2008

shigasm 

the wonderful feeling of release caused by dumping a shit either so powerful or forced to be held in until the last possible moment ("the crowning"). Can be either a verb or noun.

He experienced the bliss of a shigasm in the gas station crapper after a 3 hour, Red Bull and french fry road trip

shigasm by Brett from Cincy November 4, 2007

skigasm 

That moment when you wake up, usually hanging from a night on the lash, to sunshine and a foot of fresh pow, causing you to violently jizz in your pants.

This can also occur when watching skiporn, before you shred a line, whilst shredding a line or when you see an absolutely bangtastic female skier.

Skier #1: Mate, look out the window, it's fucking fantastic
Skier #2: Oh my fucking god...I'm pretty sure I just had a skigasm
Skier #1: Let's go shred that shit

skigasm by SuitUp5973829292 April 1, 2013

Sitgasm 

When you sit then let out an involuntary moan.

When my mom sat she had a sitgasm.

Sitgasm by Mory Ballstine January 21, 2009