What does it mean when a woman rubs your arm up and down as you hug her from behind?

Sounds welcoming but ambiguous. It could mean or not mean many things.

I would say she likes what you’re doing.

It’s a distress signal for someone nearby to see and come help her get away from you

Thanks for all the ideas. I will choose the ones I like best, because I never knew there was any meaning to the gesture.

She's hugging you back.

O.o idk

Where is she????

She wants you to let go, lol

Its a non verbal 'thankyou, thats just what i needed'

Means she wants you to bend her over and show her paradise.

She wants you to take her from behind

Did I mention I give bad advice?

She's enjoying being touched and touching back, it seems.

Or she feels comfort from a friend

She wants you

It is a crap shoot kind of like petting a cat, either the cat purrs or scratches and bites you!

She thinks you are a dick and are about to erupt