"lustful, sexually aroused," definitely in use 1889, perhaps attested as early as 1863; from late 18c. slang expression to have the horn, suggestive of male sexual excitement (but eventually applied to women as well); see horn.
mod. sexually aroused; in need of sexual release. (Refers to the horns of the goat, not a car horn. The goat is a symbol of lust. Usually objectionable.) : He said he was so horny he could honk. What did he mean?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw-Hill Education.
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