this means getting a red blood aka period stain from dancing with somebody who has a freaking period and then sees the girl's (you just danced with) boyfriend about to attack you having the same stain and you call SAMEZIES!
Means "me too" or "same." Great for situations when you are doing the same activity another person has previously mentioned. It's very catchy and will soonsweep the nation because once you hear it you will keep using it.