Slang
1) To bathe using very little and soap ( or using only baby wipes) to keep yourself as clean as possible.
2) to wash one's self in a sink at a coffee house, dinner, library restroom, or similar location using only the supplies at hand, such as hand soap and paper towels.
I was homeless for a week and had to duck into the library bathroom to take a punk bath before my job interview.
I feeling super depressed so i just grabbed some wipes and took a punk bath.