OST
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
Ost
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
OST
stands for "original sound track", means the first version of a track featured in movies, animations or video games
Street fighter got the best OST ever
by ◕_~ August 19, 2016
Ost
AND swedish and danish for cheese.
" -Faaaan va gott med en ostmacka."
or
" -Du, flensost är inte så fräscht!!"
by Jörgen M April 29, 2005
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