Top Definition
a track that changes or influences the course of your life; a song that you love so much that you are likely to play it on repeat or in a DJ set; a song that makes you want to turn the volume up to full blast.

often used as a "hashtag" in twitter.
#lifetrack : "slip" by deadmau5 is totally kicking my ass.
by lhiver November 24, 2009

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