What does OMD mean?
Oh My Days
Other definitions of OMD:
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How to use the term OMD:
There are no example uses of OMD at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:

IDKH
I don't know how

IMMD
It Made My Day

BOIK
Best Of Its Kind

2C
2) to see 3) 2 grades of Celcium (expected & undesired global warming)