For saw. Ex. I seen him before;' 'I seen her yesterday.' This corruption is common in various parts of the country.
Peter Cram's fits is awful, and go ahead of anything we ever seen.--Knickerbocker Mag., Vol. XVII
·- ·p.p. of ·see. II. Seen ·adj Versed; skilled; accomplished. III. Seen ·p.p. of <<See>>. ...
Webster's Dictionary of the English Language
·adj Having seen much; hence, accomplished; experienced. ...