jack-in-the-socks
A girl who gets used by a group of guys to help them relieve stress, only to be forgotten like a sock after a long session.
That girl was the jack-in-the-socks for the whole dorm last week.
He used his ex as the jack-in-the-socks during the football season.
She was the jack-in-the-socks for three guys at once, and it was tragic.