What does OST mean?
On Second Thought
Other definitions of OST:
- Original Sound Track
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How to use the term OST:
There are no example uses of OST at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:

CW2HU
Can't wait to hold you

INFO
Information

KAW
kick a** work

WBRB
Won't be right back