1 definition by ilove Dick
A girl that you don't want to waste a friday or a saturday on but you still want to hook up with them, so you save them for sunday.
guy1: hey what are you doing out I thought you had plans with Amy
guy2: nahh, she's a sunday girl. I'm not gonna waste a firday night on her
guy2: nahh, she's a sunday girl. I'm not gonna waste a firday night on her
by ilove Dick May 2, 2010