The correct phrase is:
on a serious note = seriously
2011년 2월 22일
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serious note means to be serious about a certain topic
the sentence you provided does not make sense.
Eliot is a dum dum. On a serious note, when does Eliot get out of prison?
2011년 2월 22일
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Alright I checked it out.
note = character
Does he ever display a serious character?
He asks, because the fighter is rather flippant about everything.
2011년 2월 24일
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typo
is your man ever of a serious note?*
2011년 2월 24일
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means "On A Serious Note"
often used in forum threads when someone says something off topic first and then types "OASN:" with something more related to the topic following