"Tomcat" or "tom
cat" refers to a male
cat, usually an outdoor or stray
cat.
A tomcat is a cat with large puffy cheeks, mostly made up of scar tissue. They are fighting cats, hence the scarred face.
Most (but not all) tomcats are infected with FIV, feline immunodeficiency virus. FIV is sometimes referred to as fighting cat disease. Which is transmitted through bodily fluid (
ie. saliva or blood)