P.K.B.S.
P. K. B. S. is when someone acts like a psycho killer with a bad attitude. They're mean, crazy, and ready to yell at you for no reason.
My cousin got P. K. B. S. because her coffee was cold.
He got P. K. B. S. after his dog ate his homework.
She got P. K. B. S. because her ex texted her 'Hey'.