gymasturbate 

When you go to the gym just to watch girls on treadmills and work out in yoga pants.

I went to work out yesterday but all I could do was gymasturbate the whole time.

gymasturbate by whitsdaddy July 13, 2012

Gymnasturbation

The act of masturbating whilst hanging upside down from the uneven bars at a gymnastics gym.

Gina was shocked to walk in on her gymnastics instructer upside down on the uneven bars jerking off, he really had a gymnasturbation problem.

Gymnasturbation by Red Joseph April 16, 2015

Gumsturbate 

When one chews gum extraordinarily loud and obnoxiously, causing you to lose your ability to concentrate.

Man, can you gumsturbate elsewhere? Your loud smacking is giving me a headache.

Gumsturbate by Solee November 16, 2010