Perv (noun)

1. A person who has a sexual attraction to or engages in activities that are considered abnormal or socially unacceptable.
2. A person who is sexually deviant.

Origin:

Slang, it's an informal and derogatory term, origin is unclear.

Examples:

1. He was kicked out of the party for being a perv.
2. People avoided him because he was known to be a perv.
3. The perv was caught peeping in the women's locker room.
4. The perv was arrested for possessing child pornography.
5. He was labeled a perv because of his inappropriate behavior towards women.