Is he trying to cop a feel?

This has happened to me quite a few times: when a guy you don't know is passing behind you (sometimes when there isn't a lot of room) and he puts his hands relatively firmly on your waist or lower back and leaves them there for a while as he passes behind you, is that a sneaky way that guys try to cop a feel? I never see girls doing it to guys.
Is he trying to cop a feel?
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