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.
by Throwtheflowers March 25, 2014
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when you insert the penis into a persons armpit region.
"the sweat and hair from the arm pit sex was to overwhelming that i cummed in the hair, making it funny and more slippery!"

"hey dad, why not some father-son quality time,lets play baseball,sorry son no baseball today,lets try arm pit sex instead i heard you get the same work out and a LOAD of fun!"
by coon_slayer March 11, 2005
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when a woman makes love to your arm pit.
young hollywood ho started on my arm pit licking, and kissing in middle on my arm pit. When a girl really loves your arm pit sex kinda turns you on, makes U feel like laying on the beach.

warm sand over your toes nice warm kissy arm pit sex nice safe sex. PS put on mexican shorts
by itichie_nocanpo June 28, 2006
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This is a sex move where you both link arms and the male inserts the hardened cock into the wet pussy (or the arse if it is another male). If it is 2 girls, one girl licks the other girl's wet pussy and with her arm grabs the receiving girl's tit. If there are more than 2, everyone link arms and just have sex.
John Marston- 'Cowpoke, me and Abigail had arm sex yesterday. It was cool.'
Arthur Morgan-'I wish I could do that with Sadie.'
by duhagfowgf8whfWG June 24, 2020
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