@LiTMac
I doubt that there is a connection.
I am not sure about the origin of the phrase, but in old illustrations hangovers are often depicted as black cats sitting on someones head, aggressively sinking their claws into it.
To go deeper into that matter: We use the female word (Katze/n) to describe the species, but use the male word (Kater) for hangover.
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@LiTMac
I doubt that there is a connection.
I am not sure about the origin of the phrase, but in old illustrations hangovers are often depicted as black cats sitting on someones head, aggressively sinking their claws into it.
To go deeper into that matter: We use the female word (Katze/n) to describe the species, but use the male word (Kater) for hangover.