Giving each boyfriend or girlfriend that you only stay with for a month will make the nicknames lose their fun! Make sure it's a lasting relationship. Did you ever give what, at the the time, seemed a harmless name to a friend or classmate? At what age did you realise it was unkind? There was a guy with. Sometimes a dirty nickname can be funny or embarrassing so please use caution when using a vulgar nickname. Most of the dirty nicknames are inappropriate.