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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.
OST by netoxic January 23, 2009
Related Words
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.
Ost by On Second Thought March 29, 2015
Oh noes Ole! Your hode looks like en ost!
Ost by bobolamedbukkake October 30, 2004
AND swedish and danish for cheese.
" -Faaaan va gott med en ostmacka."
or
" -Du, flensost är inte så fräscht!!"
Ost by Jörgen M April 29, 2005
OST - Optimum Scoffing Temperature.

Applies to food brought from late night burger bars or takeaways that is a perfect temperature to simply devour without breathing.
Man, that Kebab was OST, it didn’t touch the sides.
OST by 2ace May 22, 2009
The German word for East.
"Ost-Berlin" is German for East Berlin
Ost by guywhowritethething March 1, 2018