Hicks.

Seen: the past participle of see

By normal society used as such: "I've already seen that movie"

Urban Dictionary's Seen: (1) The uneducated and overtly trashy individuals version of "saw" as in, the past tense of the verb "to see" or (2) what white trash say instead of SAW
By illiterate fools: "I seen you at the mall the other day" or "I seen that movie".

The saddest part is how commonly "seen" is used instead of "saw" (commonly up here at least, I didn't hear it at all during my time in the city). Considering the most common tense that people talk about is past tense, it comes up quite a lot. It's painful when you hear almost everyone say "seen". It makes you want to weep for the English language.