Masturbating all day non stop for the sheer purpose of getting rid of boredom, or in some cases expressing your hatred of Sara Palin through sexual pleasure.
Not to be confused with the phrase "gregging it" which is masterbation into a hat.
Examples: 1)"I was so mad when Sara Palin but out going rouge that I just had to start greging it."
"Today I looked up pornography on the internet and started greging it because I was bored"
2)"Hey did you here what Sara Palin did the other day?"
"Yeah, i'm going to protest by greging it."
A person who would start gregging it would be someone who goes out on weekends and attempts to get laid, or someone who is very democratic.