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

URYYFM
You Are Too Wise (two y's) For Me

M4F
Man seeking woman

ARK
Act of Random Kindness

SFF
So fucking funny