YANBA. At all. Unless the user of the expression is incontinent, in which case they probably have the right .
It's a bit attention seeking really. I knew someone in school who once horrified me by getting really excited over something and then saying (in weirdly serious voice but loud enough to attract as much attention as possible and throwing her hands up at the same time): 'I. Think. I'm. About. To. Orgasm.'