ugly bastard
汚いおっさん 汚っさん ブ男 種付けおじさん uglybastard
An unattractive man, often old, bald and/or overweight.
In Japanese NSFW works, they are usually used as a "self-insert" device character, and being paired with younger or more attractive women, either through rape or prostitution. This character type is prevalent in the netorare genre.