Sned uddes was originally "Send dudes" but whoever was typing it had a stroke or something.

Sned uddes is sending someone a picture of yourself, but with a random character edited onto your face so that it is being covered up completely.
Guy: Hey, Sned uddes.
Girl1: wtf is that?
Guy: you uncultured swine
{guy text different friend}
Guy: hey, Sned uddes
Girl 2: {Sneds the uddes}
by FrogCat March 24, 2020
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