One who tags themselves on other people's posted photos on facebook. Even worse, a person who tags themselves on their own uploaded photos thus thinking the high number of tagged photos on their profile makes them look cooler... even though it could not be further from the truth. It is mostly done by bros with generic names and very insecure girls who are usually way too tan.
- Yo Mike, did you see Logan's new uploaded facebook album from spring break in cabo?
-- Yea brah, he tagged himself in every picture! Even the ones he wasn't in.
- What a lame self-tag-fag.