n. A euphemism for masturbation in reference to the song "All By Myself." Used mostly by ugly-ass high school girls passing notes at the Twins game next to the left field pole.
Ugly Girl 1: I've been Greendaying every once in a while, but i really don't think about Jesse all that often. I swear.
Environmentalist loony, literally a green fundamentalist. More concerned with appearing in the papers and on TV, and perhaps cocking a snook at Daddy, than actually protecting the environment. Doesn't worry about putting forth anything scientifically valid, in fact prefers to portray scientists as rapists of the Earth, or some such. A goon.