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1.
Being completely legless as a result of too much alcohol consumption (preferably whilst dressed as Willy Wonker).
Man, did you see Gareth last night at the party? He was Willy Wonkered!
by T Yo February 22, 2009
 
2.
To get extremely drunk, similar to "wasted" or "pissed".
Mike, I was totally willy wonkered last night!
by MikeStoke March 17, 2011