1. A word dating back to the medievil times meaning sumone who enjoys giving a blowjob while being defacated on many animal species at once.
2. In the 1920's a person who loves to be circle jerked onto by 70-90 year old gay men. The circle jerk usually ends in the person being tea bagged numerous times until he has a bruise on his forehead
3. More recently the word has come to be known as someone who has no penis or a very small one at that. If they do happen to have a penis then they use it for nothing and when the one chance they get to use it they have to "mow the yard"
1. That gillen over there is covered in racoon and deer fecies and just took a large load of the man's semen right in the face.
2. Don't circle jerk onto me there is a gillen right over there he loves it, just don't forgot to teabag him.
3. I'm so glad I'm not a gillen and can get the job done without having to go mow the yard.