A whorish girl that you pick up at 1:30 am from the bar without having to buy her a drink, or really put any effort into it at all. She's not necessarily hot, but she just wants to get banged.
Dave: Did you pick up any girls from the bar last night.
Me: Well it was getting late so I picked up a dirty 1:30.
Me: Well it was getting late so I picked up a dirty 1:30.
by Oh Dee Vee February 6, 2010
Get the dirty 1:30mug.