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Someone who consistently and often quite thirstily posts self-photographs on Instagram.
Mary-Katherine posted three photos of herself on Instagram today; therefore, Mary-Katherine is an Instawhore.
by Jacobee24 February 08, 2012
Generally females in the age group of 12-17 who participate in the social medium which is familiar to hipsters and food fanatics: Instagram. Instawhores compete against each other to take the most revealing photos of themselves. These photos are usually followed-up by numerous amounts of hashtags (such as '#Swag' and '#YOLO').
Jess: Hey Krystal, let's have a competition to see who can take the most amount of pictures of ourselves with barely any clothes on before our accounts get reported.

Krystal: Oh my gosh! That would be so awesome! We're gonna be such Instawhores. YOLO!
by #BrodoSwagginz January 03, 2013
She didn't want him but when she realizes he has a lot of instagram followers, she wants to be an instawhore.
Example: Katelyn is such an instawhore, I told her I had 50,000 followers and then she wanted to date me.
by Chinese Chicken Wing October 02, 2014