A phrase used instead of what the fuck or what the hell when you are in the presence of an adult or little child who you dont want to hear you say fuck or hell etc.
A phrase used in a state of confusion. Can be used when someone says something completely ridiculous. An expression used when "what the eff??" or "what the hell?" just don't cut it.
It is also used during experiences of shock and extreme irony.
Adam: (telling the guys a story at the lunch table) We took the car doors off of my car and put them on Jeff's car, then we drove around town for 40 minutes with the heat blasting.
Vinnie: Adam, What the Mother??? it is effing June!!!! hahah