When you discretely take a girl into a port-a-potty and have sex with her from behind. During this process you push her head into the toilet bowl, causing her hair to turn blue. Everyone will clearly know what happened to her and the embarrassment will commence.
That girl just got railed in the port-a-potty and got blue doo-ed! Ho!
ayon kay mastamahars ika-08 ng Hulyo, 2009