What is "floppers"

Usage examples of "floppers".

And these are big, mean-looking cocksuckers, shades, wet black hair all over their stomachs, big floppers tucked in their bikinis, and they're giving the kid a terrible time sending food back to the kitchen, complaining the drinks taste like there's bathroom antiseptic in them, running the kid back and forth for cigarettes and candied cherries and sun cream for the gash and anything else they think of.