What does STO mean?
Sticking Out Tongue
Other definitions of STO:
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How to use the term STO:
There are no example uses of STO at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:
WMPL
Wet My Pants Laughing
SYM
shut your mouth
IBM
Inadequate, But Marketable
AAF
As A Friend
