Ready to wet the party up,
To “wet” is to “kill” (bleeding makes you wet); Napoleon wants to “wet” the party he’s at, just as his namesake made the fields of Austerlitz run with blood!
(Also, “wet the party up” is a pun on Prohibition-era use of the word “wet”, i.e. “I’m going to bring some moonshine to the party for people to drink”)
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