Short stand for "Original Sound Track".

-Recorded music accompanying and synchronized to the images of a motion picture, television program or video game
-A commercially released soundtrack album of music as featured in the soundtrack of a film or TV show
-The physical area of a film that contains the synchronized recorded sound.
Guy1: hey Guy2 i just got the OST "The Eye of the Tiger" from the movie Rocky III to my iPod.

Guy2: cool Guy1, let me listen to it.

by netoxic January 23, 2009
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stands for "original sound track", means the first version of a track featured in movies, animations or video games
by ◕_~ August 19, 2016
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buy the domain for your pet vlog
To undo, take back or recall, change one's mind
1) I'm so glad I could ost that sext I accidentally sent to my dad!

2) Did you ost that email to Jake?

3) I'm so glad I osted that tweet before the media storm.

4) By osting the text message, Tom avoided an extremely awkward encounter with his boss.
by On Second Thought March 29, 2015
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AND swedish and danish for cheese.
" -Faaaan va gott med en ostmacka."
" -Du, flensost är inte så fräscht!!"
by Jörgen M April 29, 2005
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