Both words have been around since I was a nipper.
That's 20 years. Does it still count as a neologism?
( Master Of Turnips. Only gays and morons believe in ghosts., Mon 1 Jun 2009, 13:49, archived)

I don't think it's about how old it is,
so much as how well accepted it is.
( Moon Girl Technologies horrendous beanbag, Mon 1 Jun 2009, 13:50, archived)

Etymonline.com notes
"Shat is a humorous past tense form, not etymological, first recorded 18c."

So it's pretty old, but was made up to be funny.
( Moon Girl Technologies horrendous beanbag, Mon 1 Jun 2009, 13:54, archived)

This.
I know it's not the correct past tense. My dad says it, and I used to find it hilarious when I was little.
( Esme Weatherwax I swear on my tash it's daycent hash, Mon 1 Jun 2009, 13:57, archived)