Usually used to describe a song without vocals. Also known as Backing Music
www.backingmusic.com
by Lee Crossley April 19, 2005
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The part of the song which is just the intstruments is called the "Backing Track" or "Instumentals".

It is useful to get these tracks if you wish to spoof a song, but make it have the same beats/sounds in the background as the original.
That singer is really bad, but I like the tune. I think I will just try and get the backing track and record my own voice over it. That'd rock!
by Joshtek January 4, 2004
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when having anal sex with a girl and she defecates on the penis while it's inserted into the anus.
i was fucking this girl in asshole so hard she started back tracking on my dick.
by mitchel. February 4, 2009
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When a song plays back in your head over and over.

When one has recurrent flashbacks of a track.

When one refuses to stop singing on repeat only a small portion or snippet of song.
Listening to top 40 often causes track backs for listeners, who on occasion get a song stuck in their head.
by Snow Pea - Digit El Poal S.Sa September 27, 2016
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