lady night
A guy who acts like a wimp and leaves the group before the fun starts. He probably went home to watch TV or took a nap.
My buddy called me a lady night. He left the party early to go home and watch cartoons.
At the bar, my friend said, 'You're a lady night, man. You left before the game started.'
My cousin got called a lady night because he left before the game and went home to eat pizza.