/kat"seuhn jam'euhr/ , n.
1. the discomfort and illness experienced as the aftereffects of excessive drinking; hangover.
2. uneasiness; anguish; distress.
3. uproar; clamor: His speech produced a public katzenjammer.
[ 1840-50; Katzen (pl. of Katze CAT 1 ) + Jammer discomfort, OHG jamar (n. and adj.); cf. YAMMER ]