When a girl tries to make you believe that she is pregnant or that you are her baby's daddy, until it is proven that said dad is not the father or that the girl is not pregnant at all.
Ex) Girl: Im pregnant. I took the test just now
Boy: Can i see the stick?
Girl: Why do need to see it, can't you just be happy we are having a baby?
Boy: Are you pregnant or not?
Girl: why Can't you be happy we having a kid.
Boy: idk i just don't want to have a fakey mama, you can not be pregnant the whole time, and have me feel some kind of way just to find out you're just my fakey mama and not my baby mama.