notch in the bedpost
A person you've had sex with. Derived from the practice of tallying the number of sexual partners you've had by indenting your bed post. It is often used in derogatory fashion, by representing that a person is recognized solely as a past sexual achievement.
Tom: Hey, what happened with that girl...Sarah?
Kyle: Meh. She was just another notch in the bedpost.
Kyle: Meh. She was just another notch in the bedpost.
notch in your bedpost
one more person you've fucked. Similar to the expression "under the belt" or "in the bank." As popularized by Fall Out Boy.
I'm just a notch in your bedpost.