A tom, a male cat.
"The stray tomcat prowled through the alleyway looking for food."
To prowl for sexual gratification.
"The old tomcat prowled the neighborhood at night, looking for a mate to satisfy his urges."
In plain English: To tomcat means to act like an unattached male who spends all his time looking for romantic partners instead of focusing on anything else.
"The old tomcat was known to wander far from its home in search of food."
The word tomcat comes from combining "Tom" with "cat," following the naming convention established in 1760 when an anonymous author referred to a male feline as Tom in The Life and Adventures of a Cat. This usage popularized the specific term for adult male cats.