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!
yes... SUPERBAD was that awesome!
Caution: not to be used in face to face conversation, people may think your retarded. only to be used over the computer. such as IM
person 2: nothing much, you?
person 1: samezy.