Do you know Joe?
Joe mama, mama, a, a, mama, a, a, amam.
Do you know Joe?
Joe mama, mama, a, a, mama, a, a, amam.
Listen here, buddy. This joke is playing on the classic "Who's Joe?" gag. The setup is "Do you know Joe?" and the punchline is "Joe Mama" which is a reference to "Your Mama." It's supposed to be funny because it's unexpected and slightly insulting. BTW, you are an orphan.