Definitions by Invasive Protusion

A Melvin 

An underwhelming male orgasm. If ejaculate is present, it dribbles feebly and apologetically out.

Did you just jizz your pants? Yes, but it was only a Melvin.
After wank number 5 that day, he realised was no longer enjoying himself, as his overworked phallus begrudgingly performed a Melvin.

A Melvin by Invasive Protusion May 13, 2016