What does STO mean?

Sticking Out Tongue

STO

Other definitions of STO:

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How to use the term
STO:

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References:

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More slang terms:

YACC

YACC

Yet another calendar company

OF

OF

Old Fart

NFIAH

NFIAH

Never fear, I am here

LMCOA

LMCOA

Lost My Connection Once Again