Arm Sex

1. To hug someone
2. When your arm rubs up against someone else's arm (on purpose or accidentally, doesn't matter)

Note: May also be called an "arm fuck" or "arm fucking".

Girl: Are they dating?

Boy: Just because they have arm sex on a regular basis doesn't mean they are!

Girl: Oh, just friends then?

Boy: Say... can we have arm sex?

Girl: Ew, no.

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