noun; a three month relationship is the result of what happens when someone is skeptical about dating another person and they end up going out quickly realizing that it wont work out, these relationships on average last around three months hence "three month" it is an alternative to being friendzoned/put in the friendzone
joseph~hey sarah are you going out with kevin?
sarah~no, i dont want another dumb three month relationship
kevin~..... cries.....