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1.
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

can also be used as OMSN(On A More Serious Note), or OSN
THREAD TOPIC: FAVORITE MOVIES
my favorite movies are all the ones i stared in, directed, wrote, and produced

OASN: haha, no but really i like mostly anything made by Steven Spielberg or Michael Bay
by Nosredna RM December 22, 2009