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
by Twistedkane138 November 18, 2013
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 02, 2010
by ningningology June 19, 2023
a girl who only looked good saturday night because of the paint roller makeup. sunday morning? shudder
by aravod March 29, 2006