easy bikini
An easy bikini is a girl who'll do anything for a good time. Even if it means getting naked in public and making you look bad.
She was an easy bikini because she walked into the mall in just her underwear and made everyone laugh.
He said she was an easy bikini after she took her clothes off in the grocery store line.
She got called an easy bikini because she stripped in the breakroom and told the boss to shut up.