Orphans want girlfriends to call someone "Mommy."
Orphan's Wish
Explanation
Explain Bear
Hey, chucklehead! So, orphans don't have moms, right? And what do girlfriends sometimes call their boyfriends? Daddy! So, the joke is that orphans want a girlfriend to fill that mom-shaped hole in their heart. You probably still miss your blankie, don't you?