Ploov is an insult. It's another way to call someone a tool, a dumbass, a posuer, or a bitch. This word is deeply rooted in Mrs.Herken's advisory class at Pleasant Ridge High School in Kansas. The students started using ploov since the teacher didn't know what it meant and that way they could easily avoid getting a detention.
Ex 1: Good Charlotte is music for ploovs, but Beastie Boys and Franz Ferdinand is music for cool ppl.
Ex 2: Charlie Heugel is a ploov...so is Mrs. Herken