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The point at which you are so very, drunk/fucked that you Chunder, but not so very, very drunk that you are paralytic i.e. cannot talk. Therefore chunderfucked as opposed to actually fucked, totally trashed or absolutely wankered.
'Darling, I was so utterly Chunderfucked last night'

'Would you take a look at that, Darling? That girl is absolutely chunderfucked!!'
by Absolutely,Darling November 03, 2009