relative hotness 

The phenomenon where a member of the opposite sex (or same sex for homosexuals) seems increasingly attractive due to a lack of attractive people within certain surroundings.

For example, while at work one may begin to think that the girl sitting two cubes over is hot, when in all actuality she is not. This perception of hotness is based solely on the fact that she is the only female in the office under 60 and/or under 300 lbs. Outside of the office, she would not stand a chance to an actual hot or cute girl.

Dude, relative hotness is kicking in bad.. I wouldn't mind gettin' a piece of that big girl on the other end of the conference room table.

relative hotness by BigBoi on Trone November 1, 2009

The Theory of Relative Hottness 

The theory that states that one judges a guy/girl's hottness by comparing him/her to those around them. This explains why one would think someone is hotter when seen at, say a movie theater, than at school. There are fewer to compare them to.

Guy 1: Dude, that girl that goes to your school is really hot.
Guy 2: Naw, that's the theory of relative hottness. At school she's not that hot.

The Theory of Relative Hottness by Free6000 December 17, 2008