The stereotypical pose white girls do in their Instagram photos, where one has their arms up in the air in a V shape with their back to picture taker. Often done in iconic landscape scenes in a vain attempt to make the picture more dramatic. It's not known why this phenomenon exists only among women, but some theorize it's done in order to make the insta armer seem more adventurous, extreme, and free spirited... even though there is generally a major road or the car mere feet away.
Hey Chris did you see Becky's last photo on instagram?

No Kev, let me guess insta arms?

Yeah, she added a filter too. She's so free spirited brah.....

(Chris roles eyes)
by FoxMulder69 December 9, 2018
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