Bacon: fans think "Baekhyun" sounds like "bacon". Also because they think he's greasy
Baozi: Luhan's nickname for Xiumin because "baozi" means "steamed bun" in Chinese, and Xiumin's face is round and soft
Bitchface: Kris is known for his cold stare, an expression fans noticed since his introduction
Creepyeol: originally from a picture of Chanyeol from the Showcase that made him look crazed
Diva Lay: from a predebut video of Lay dancing to Wonder Girls' "Nobody"
Dancing Machine Chen: Chen's proudly self-proclaimed title after a fan joked that he was "dancing machine Jongdae" (poking fun at his dance skills)
D.O_O: because ever since the Showcase, D.O. has been known to stare with very wide, surprised eyes
Enjoy the Mayo: non-Chinese fans think Luhan's first line in History, "ganjue de meiyou" sounds like "enjoy the mayo"
Grandpa Suho: because he is the oldest in EXO-K, trained the longest, behaves like an elderly person, and likes to play golf
Gucci: a predebut photo of Tao showed him posing next to a large Gucci sign
Gull: Chen's beginning Engrish lyrics to What is Love: "gull, I can't explain what I feel"
JPEG: because Lay spaces out a lot, when he's not talking he goes into "jpeg" mode (as in, image format), implying that he's very still and unmoving
Khamjong: "dark-skinned" in Korean + Kai's real name "Jongin", nickname given to him because he has tanned skin compared to the other members
Kungfu Panda: Tao's nickname because he looks like a panda, a symbol of Chinese culture, and also practices wushu
Light-switch: from Baekhyun's predebut video of him raving with his friends by flipping the lights on and off
Marilyn Monroe: Luhan's nickname (that he dislikes) because it's a pun of his name and Monroe's Chinese name, "meng lu", where "meng" means cute and spacey while "lu" is his surname; also because he looks girly
Maybe Next Time: Kris' phrase because he says this every time he's asked to perform during interviews
Thehun: Sehun has a slight lisp so fans joke about it
