Writergasm 

An ecstasy experienced when your writing is going particularly well (a scene comes out exactly as you pictured it in your head; you're in the shower and you suddenly get unstuck on a story; your writing is so good and flows so easily it's like the muse has your hand; your writer's block ends; etc).

I totally had a writergasm yesterday: a scene came to me and I was able to write it word for word exactly as it was in my head.

Writergasm by mordredlefay April 11, 2011

Watergasm 

The euphoria created after a surfer catches and successfully rides a great wave.

"I just had a watergasm, did you see that wave?, it was awesome"

Watergasm by Water Baby 1969 March 26, 2015

Watergasm 

When you have an orgasm while drinking some god damn good water the morning after getting fucked up at a party

"Bro that party was so good last night and this morning i totally had a Watergasm"

Watergasm by Connor.Brookes February 28, 2015