1. To know someone through social media connections without ever having met in person, and without the other person necessarily knowing who you are.
To be in a mixed state of flattery and disgust following the admission by another person that they have fet you.
Australian. Derivative of "facebook met". (French, fete; Latin Latin fētidus)
Daz at the street lights: "Erin? Hi, we've fet before"
Erin dashing across the street when the lights change: "I'm so fucking fettered right now"
I spent the afternoon fetting peeps.