the state or quality of being "seened" is to be under the influence of any of the following substances, including but not limited to: pot-seen, perc-seen, vic-seen, beer-seen, liquor-seen, or any other substances which can get you all seened. seen.
an excessively used term by the teens in mississauga describing something as "cool" or a shorter form of saying "understood" but in that hip, cool, and trendy gansta way.
also used as an expression (by the idiots in mississauga) of surprise and unexpectancy.
tim: "yooo check out my new tim's!"
sam: "YO! thats SEEN."
or
ian: "yo go play risk in my basement later, seen?"
david: "seeeeeeeeen."
or
*kristina spikes the ball and scores the winning point in the volleyball game against woodland*
tim: SEEEN! *jaw drops*