When you've previously slept with someone and then years later sleep with them again. In this case they don't count as a new lover so your number never goes up.
a woman that a man has already enaged in sexual intercourse with one or more times in the past
Tom: Yo Eric, did you get a fresh kill last night?
Eric: Nah, but I did bang this girl that I used to see in college.
Tom: Oh well, don't worry, nothing wrong with a repeat offender
A customer, who habitually returns purchases, for no good reason, other than to be a complete pain in the ass. During the original purchase, they bombard the salesperson, with questions regarding refund and return policies. So frequently and with such conviction, the salesperson can almost predict them coming back within 48 hours or less. This process can possibly go on for months, before it is finally resolved. Easily spotted, because everything they say about the product is jaded and pessimistic.
"That guy's my 'repeat offender'. Send someone else to deal with him. On second, thought? FUCK THAT SHIT. Throw his ass out, and call the cops if me makes a fuss!"