Ross was super psyched to hit the beach until the 3-way mirror at Pac Sun revealed to him his nasty case of backne--luckily his 3-month supply of ProBacTiv was on its way.
Protective custody is the place in county jail where the snitches, child molesters and homosexuals are placed. PC for short. PC punks are what the inmates are called.
Dumbass is now in protective custody because he snitched to the guards about homeboy making pruno.