To take a sly look at a person or a part of a person, or possibly an animal or part of an animal etc., whilst imagining lurid sexual fantasies involving the object of the obsession.
Foxy lady:
Were you looking at my arse again?

Goddam faggot:
He was I saw him at it.

Normal guy:
Yeah... I was just copping a perv.

Foxy lady:
Oh right...ok...and you mind yer business shit stabber, yer just jealous.

Goddam faggot:
Hmmm..he is nice.

Normal guy:
Have you been copping a perv you bender?
by isleofwightinsider November 11, 2008
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