Paraphilia, "in psychology and sexology, is a term that describes a family of persistent, intense fantasies, aberrant urges, or behaviors involving sexual arousal to nonhuman objects, pain or humiliation experienced by oneself or one's partner, children, or nonconsenting individuals or unsuitable partners." (Wikipedia) Or, in the parlance of the street "freaky shit".
Someone who performs Frotteurism is called a frotteur.
There is a particular Paraphilia known as Frotteurism.
Frotteurism the non-consensual rubbing against another person to achieve sexual arousal. The contact is usually with the hands or the genitals and may involve touching any part of the body including the genital area. The majority of frotteurs are male and the majority of victims are female, although female on male frotteurs exist. (Wikipedia)
The most colorful vernacular description of frotteurism I've heard is "Cock-Drag Driveby". A man that performs a "Cock-Drag Driveby" is know as a "Monkeydawg".
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