SFWUZ full form

SFWUZ full form-safe for work until zoomed

What is the meaning of SFWUZ and full form ?

When a person sends someone an email at work,he /she normally marks it as “safe for work” and can elaborate in a funny way by adding “until zoomed”.The zommed version of the image might contain something more exp[licit so this is an early warning caution to the receiver.