A male cat; also slang for a man who chases after romantic partners frequently.
From 'Tom' (a male name used generically for animals) combined with 'cat.' The term arose in the 1600s when 'Tom' was already used for male animals; female cats were 'Tabbies' from a striped fabric pattern.
The word 'tomcat' revealing that female cats were historically called 'Tabbies' shows how our language preserves old gendered assumptions. Female cats got named after a type of fabric while males got just... 'Tom'!
Complete word intelligence in one call. Free tier — 50 lookups/day.