CYFB
Check your Facebook
Example
CYFB when you get a chance. I sent you a message
CYFB definition by Slang.net
This page explains what the acronym "CYFB" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Someone who sent you CYFB wants you to "check your Facebook." This person either a) recently sent you a FB message or b) noticed some Facebook drama they think you should see. Either way, you should log into your FB account ASAP to see what's poppin'.
You're most likely to receive CYFB via a text message or a DM on another social media platform. Hopefully, the message in which you received CYFB contains some additional details, telling you why you so urgently need to check your Facebook.