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As in the song down by Stone Temple Pilots (STP) when you are in a insane asylum and you are allowed a conjugal visit on sunday
"Yeah I've been waiting for my Sunday Girl"
by Twistedkane138 November 17, 2013
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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
by ilove Dick May 02, 2010
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