"buffoon, clown," 1640s, from Middle English Thom Foole, personification of a mentally deficient man (mid-14c.), see Tom + fool (n.).
: In his younger days he was a notorious tomcat
To pursue male sexual activity avidly
[1927+; fr the common name for a male cat, popularized by the 1760 book The Life and Adventures of a Cat, in which the creature was named Tom]