Meaning of SY
What Does SY Mean? (Using SY Online)SY means "Sincerely Yours".
Summary of Key Points
Definition for SYSY means "Sincerely Yours". This is the most common definition for SY on Snapchat, WhatsApp, Facebook, and Twitter. Here is some more information about SY:
2: Quite easy to guess
Adults and Teenagers
A Text with SY
Using SY on a Cell Phone (SMS Texts, Whatsapp, and Yubl)