A lot vs. Alot: 9 Grammatical Pitfalls
1809, from Tom + cat; probably influenced by Tom the Cat in the popular children's book "The Life and Adventures of a Cat" (1760); replaced earlier Gib-cat, from diminutive of Gilbert, though Tom was applied to male kittens c.1300. Used of the males of other beasts and birds since 1791. Cf. also Tibert. The verb meaning "to pursue women promiscuously for sexual gratification" is recorded from 1927.