A man that chases after a woman especially if he knows that her man is cheating on her.
A man that crashes at a woman's home to "make sure that she is okay" after she has been left or kicked her current spouse or partner out of that home.
That dude is such a tom cat...see how he just crept up on that
Locker room Dude says "Aww man, Ronnie was facing the other way in the shower and pissed all over my legs!"
Homeboy responds "You have to be careful, he likes to tomcat."
Homeboy responds "He always does the tomcat in the shower."