Definitions by Sir Jerks-Alot

turdgasm 

the simultaneous expulsion of both feces from the anus and jizzum from the penis.

can be done through masturbation or part of a blumpkin

perfect timing is necessary

Whilst spanking on the toilet, I had an earth-shattering turdgasm.

turdgasm by Sir Jerks-Alot December 25, 2002