The act of pressing down on your mountain bike helmet hard against your head to excrete sweat. It also is the sweat that comes out.
Man, it is hot, I need to squelm.
Squelm is the feeling you get before you are about to jizz during masturbation.
It is really annoying when you have to stop jacking off when you are in squelm.
My phone rang when I was in squelm and I had blue balls all day.