Sooo, for people who don't understand the usernames I used for the EXO members in my "12 Days of Christmas" fic (cause my puns are really bad), here's the explanation!

EXO-K
SUHO/SU-HO-HO-HO - This one's pretty easy and super cringe-worthy. I combined Suho's name and the phrase/saying/line(?) that people normally incorporate Santa Claus saying. So, Suho + Ho, ho, ho = Su-ho-ho-ho.
BAEKHYUN/BAEK-THE-HALLS - One of my favourites! The song title is originally "Deck The Halls" and I just used Baek from the first part of Baekhyun's name to replace Deck cause it ryhmes. So, Baekhyun + Deck The Halls = baek-the-halls
CHANYEOL/CHANYELF - I was going to go with Yeoltide as in yuletide but then I remembered Chanyeol's ears and I went with Chanyelf! I took out the yeol from Chanyeol's name and replaced it with elf. So, Chanyeol + Elf = Chanyelf.
D.O./MISTLED.O. - You all know mistletoe, right? Well since toe in mistletoe and D.O. sound similar, I just switched the two words and voila! So, D.O. + mistletoe = mistleD.O.
KAI/CANDYKAINE - This was my last resort, Kai's name was so hard! But I went with it anyways. Again, the cane in candy cane was replaced with Kai so it's kaine. So, Kai + candy cane = candykaine
SEHUN/HAPPY-HUNUKKAH - I want to punch sehun for having such a difficult name to make Christmas puns with. I know it's not really Christmas but my cousin suggested it and there's really nothing else you can do with Sehun's name, if you have an idea please let me know cause you're amazing. Anyway, it's originally Happy Hanukkah and I just changed the Han in Hanukkah with hun from Sehun's name. So, Sehun + Happy Hanukkah = happy-hunukkah.

EXO-M
XIUMIN/FROSTY-SNOWMAN - I didn't use a pun this time cause Xiumin's name is just as hard to make puns with like Sehun's and I want to punch them both but they're too precious (and they're my biases). If you remember waaayyy back from the "MAMA" era, Xiumin's power was frost and there's a song/character named Frosty the Snowman so I thought why not. 
LUHAN/LUDOLPH - It sounds a bit weird but trust me, I'm a genius. You know Rudolph the Red-Nosed Reindeer? And Luhan's name meaning deer (Xiao Lu, I think)? Well combine those and you get Ludolph! It's both a pun and a little bit of a connection. Replace the Ru in Rudolph with Lu from Luhan's name and it's Ludolph. So, Luhan + Rudolph = Ludolph.
KRIS/MERRYKRISMAS - Kris has an easy name like this honestly took me 2 seconds to think about. I switched the Christ in Christmas with Kris so it's Krismas which you've probably heard 500 times already. So, Kris + Merry Christmas = merryKRISmas.
LAY/XINGLEBELLS - I AM SO PROUD OF THIS ONE, I THINK I DESERVE A PRIZE. From the song "Jingle Bells" I replaced the Jing in Jingle with Xing from Lay's real name (Yixing) and you get Xingle. So, Lay/Yixing + Jingle Bells - xinglebells. No but really, it's clever right?
CHEN/DAESHINGTHROUGHSNOW - Kill me now, his username is so damn long. From a line in "Jingle Bells", they sing "dashing through the snow" and from Chen's real name (Jongdae), I switched the da in dashing with dae from Jongdae and it's daeshing. So, Chen/Jongdae + dashingthroughthesnow = daeshingthroughsnow.
TAO/SANTAO-CLAUS - And this was the username that gave life to this fic! I remembered watching EXO'S OVEN RADIO in 2013 and how "SanTao Claus" showed up with cards and stuff, I couldn't stop squealing. Anyway, I added an o the the end of Santa to make it Santao cause of Tao's name. So, Tao + Santa Claus = santao-claus.

I hope that cleared up everything but if you still don't understand some of them then just leave a comment on the story or on this blogpost. Anyway, happy reading and I hope you don't cringe too much from the fic! I deeply apologize for that in advance!