Definitions by Schloss

sem-dog 

A half boner, or semi-erection where the penis is not yet completely erect, but not completely flacid.

Dude, that super hot chick gave me a hug and before I had any idea I was sporting a mean sem-dog.

Can I get a sem-dog for my Rem-Dog. (Said when you want your friend Remy to get some ass).

sem-dog by Schloss January 13, 2006