mini orgasms?

I keep having weird mini orgasms or I don't know what they are? I will just be going about my day and then I think of my boy hookup or something and a rush goes through my body and vagina and it tingles me and then when I sit down to pee my vagina tingles and I can't even pee until that time passes because it won't allow me and I'm not even thinking about anyone when that happens?? What is this and why does it keep happening ??