The state of a persons back; when they do not wash their back during a shower, the accumulation of dirt and dryskin which literally looks like barnacles.
The words you can say to mean "Fuck Boy" or "Fuck Boi" when you can't swear. In the television series, "SpongeBob SquarePants," the word 'baracle' is used as a curse word, giving it its place in the phrase "Barnacle Boy" as an alternative to "Fuck Boy/boi".
Me: Oh my god; I just spotted the fuckiest fuck boy.
Random Person: *gasp* Don't say that -- he's a Barnacle Boy!