I call my girlfriend this Because shes so cute (even though shes older than me by about 3 years lol)
But she is very very cute and I love her more than anyone in the world!
and because she IS Smitten. shes always like a curious and extremely playful like a kitten!

Two other good nicknames I call her is Sugar-Butt, Pumpkin-Butt,Bubble-Butt and Pepsi Face because she always has a blue face like a Pepsi can. and It seems to cheer her up ^_^