When someone nuts on a guys nuts and licks it off.
"Woah nigga that done nut nugget'd that dude"
Just a stupid in-joke that people on the /mlp/ board on 4chan say. It's meant to be an anti-joke, with the idea that people will ask "What's a snowpity?" just to find out it's a nonword that doesn't make sense and that the joke is it doesn't make sense.
>He doesn't know what a mare's snowpity is
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