Mobius Moustache = A big moustache - that goes down along the side of your mouth and then goes up along the edge of your jaw, and then becomes your sideburns, and then becomes your hair. (As in A Million Ways to Die in the West.)
“Oh? And just what kind of moustache are you looking to grow?”
“A big one - Like one of those ones that goes down along the side of my mouth and then goes up along the edge of my jaw, and then becomes my sideburns, and then becomes my hair.”
“A Mobius Moustache, that’s the one.”