It is what women and human "males", who are not MEN, write on internet forums because they think it is a cute expression of being happy. These are the same people who write "sigh". They most likely all drive a Toyota Prius or a Smart Car. If these humans are in your office, it is considered customary to beat their legs with a rubber hose.
Oh hey, there is a new episode of Dancing With The Idiots on tonight! SQUEEE!