'Plhop' is the antonym of 'Phat.' Below one's standards, unhip, uncool, uncooth. Alternately, doubles as spelling of 'Flop.'
-I hate this car, it's totally 'phlop'.
-The old axiom is true: Give a man a fish, he eats for a day, and that's 'phlop.' Teach a man to fish, and he eats for a lifetime, and that's phat.
My penis is 'phloppy,' meaning, it is not erect.