Devin Brugman walked around in a bikini and posted it on Instagram because Devin Brugman is apparently a "bikini blogger" which I think is a term she pretty much made up. I don't know if she blogs about bikinis or if she blogs while wearing bikinis or if she just buys them and then takes pictures in them and then returns them like some sort of bikini spy. No I don't know what that last one means either.
She could also call herself "doughy girl that likes beer, pizza and beef sandwiches at 2am after a night of blackout drinking." and I bet that description would be just as accurate as bikini blogger. And no I didn't read the comments on any of her pictures believe me I don't need that in my life right now.