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1.
Referring to the first, yes it is derived from STFU which means "shut the fuck up" Stuff you is a tamer version more widely accepted, yet still holds the same message of shutting up.
dude: hey why dont you see me some time?

chick: stuff you and go away!
de TEEG 20 février 2006
 
2.
Verb.

Derived from the term stfu.
KeWtLiLaNgELgUrL69: hey u sem kewl kan i add u to mah budilist??!/1
Regular Person: Stuff you.
KeWtLiLaNgELgUrL69: wat/!?1/
Regular Person: ::blocks::
de Jerk The Mom 2 décembre 2003