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Used a lot in the american comedy, 'My Wife And Kids'. Basically means no. Sometime it's exaggerated, like when Michael says 'er' his wife might do a drumroll or something then he'd say 'na'
Claire: Daddy can i go to a study party tonight?
Michael Kyle: Er...
Jay: *Drumroll*
Michael Kyle:...Na!
by Devilli$h November 23, 2004
An amazing, attractive, sexy, fun, perky person capable of doing extraordianry things and if you ever do come across someone named this, you have found the answer to life.
Hey, did you see erna? Yeah her booty was POOPIN'.
by Harry_1111 May 26, 2012