A male who is partial to busty women, particularly their big breasts. He enjoys female breasts so much so that he would often rather titfuck a woman as opposed to actual intercourse.
Other variations of the term include tit man, breastman, breast man, boobman, boob man, etc.
It's every titman's dream to receive a double titjob from two busty girls...
one who indulges himself in the art and science of tits. This can range from everyday observation of breasts to the occasion of playing with a big-titty-ass-bitch.
Sometimes followed by numbers in order to show a level of Titmastery.
Eddie is a serious Titmaster, he's scoping them out all the time.
Brian is a Titmaster 4000, while Erik is but a measly Titmaster 300