Sexual arousal from seeing or touching the buttocks of another person. The term is not
gender-specific. A person who is thus aroused is a "pygophilist" or "pygophile"; "pygophiliac"
may be used if the arousal could be considered abnormal, pathological or extreme. In a finer sense, "pygophilist" can be used to infer a person whose predilection includes actively touching buttocks, as the suffix -ist connotes "
one who does", whereas "phygophile" (-phile, "
one who likes) could include those who are content merely to look at buttocks.
Pygophilia is not that uncommon - my best friend is a total pygophilist - but that
guy at
the office has had his hands on more ass than a donkey
breeder; he's a complete pygophiliac.