A man that a woman uses for sex when she is between relationships. This man has no future in her life, he is a tweener weiner.
Scarlett had suffered sexual famine though she pursued a viable mate, she had been celebate for 5 months. She even became revirginated.
In a moment of lusty weakness she telephoned Maggie to say, "I am gonna do that sweet young pool boy." To that Maggie replied, "Set yourself free! He can be your tweener weiner baby!"