Pre-Shirt
The shirt(white tee or tank-top) you wear around the house before your ready to change into your real shirt for the night.
I was wearing my pre-shirt before on put on my Ed Hardy shirt to go to the clubs.
pre rave party shirt
when someone is tricked into wearing a shirt that has been secretly swabbed with semen
so did you hear about those dudes who got their buddy to rock a pre rave party shirt!?