Chaser (gay slang)

A chaser or chubby chaser in the gay community is generally a male who is attracted sexually or romantically to bigger males.

Hierarchy
Chaser: A chaser is generally an average-weight male who is attracted to stocky, chubby, fat or obese males. However, some of the latter also consider themselves as a chaser since it is quite common for either a stocky, chubby, fat or obese male to be attracted to the same. The term chub for chub (abbreviated chub4chub) is often used in this case in personal ads, chat rooms, and the like.