Top Definition
2DSO = 2 Day Song Obsession.

Usually lasts 1-2 days. It's when you become obsessed with a song and you have the loop button playing that song on your itunes for hours at a time. At the end of a couple days It usually wears off.

It can be very annoying to other people, and you constantly get yelled at for singing it, but In the end the enjoyment you get from the song is usually worth it.
"Don't go in there, she's got 2DSO again"
"Really?, what song?"
"Province", she's had it on loop for hours already"

or

"I think I have 2dso.This song has 80 play counts in 24hrs."
by musicmaniacme May 24, 2009

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