LURKER

Someone, usually a creepy male, who has airdropped themselves into a space that they are not supposed to be in. Can be found inserting themselves in social scenarios they are not a part of and also lacks an understanding of social norms.

Examples of lurkers:
Man over the age of 25 at a college bar.
That frat boi who is always at the bar anytime you go.
Man who wears sunglasses at a club.