a man of ill-repute
"Women regularly use him for sex. It's as if they're passing around a used tampon. I can't understand it."
any, all, and every dangerous, used penises that was previously inserted into anyone else
"Girl! I had no idea he was a used tampon. We met last night but I wouldn't have thought that he ever did that before!"
the defiled penis, any defiled penis, every defiled penis
"Help! My penis has been turned into a used tampon! I should've stuck with one woman for my whole life"
the penis of a cheating husband
"I just cheated on my wife. I'm a used tampon!"
a penis that has been defiled by, inserted into, the orifices of more than one person, without remorse
"I'm poor! I'm a used tampon! What shall I do to fix my poor situation?"
A Q-tip, more notably a used Q-tip improperly disposed of, not in the garbage bin. Left out for potential public viewing and inevitable shaming.
My wife keeps leaving her waxy ear tampons laying around, now our cat is playing with one in front of her mother.