katzenjammer (noun)

a. A hangover, or a symptom of one.

b. transf. and fig. An unpleasant aftermath or reaction; depression, ‘blues’; clamour, uproar.

c. Katzenjammer Kids (or Children), mischievous, naughty children; enfants terribles. So called from the title of a comic strip, first drawn by Rudolph Dirks in 1897 for the New York Journal, featuring Hans and Fritz, two incorrigible children. Also attrib.

**Watch our for us Katzes. We come with aftermath.

(definition culled from the wide & glorious Oxford English Dictionary)