Me: Joe left today.
Orphan: Who's Joe?
Me: Joe mama!
Me: Joe left today.
Orphan: Who's Joe?
Me: Joe mama!
Listen up, chucklehead. This is a classic setup. One dude asks "who's Joe?" and the other dude replies "Joe mama!" which is a funny way of saying yo mama. It's funny because you're calling the dude's mom "Joe." Get it now, genius?