lately I've been favoring the 'long time no see' expression, been noticing it more frequently in dramas I've been watching. But don't know how to spell it correctly.
Omo and Aigoo just remind me of funny ahjummas in dramas

Jinja and kamsahamnida are cute little sayings that always makes me think of high school romance dramas

Saranghaeyo in dramas its always, Always, ALWAYS said in a tearful, confession that brings me to tears



Annyeong
Kyeopta
Pabo
I love 멘붕 [men-boong] or 멘탈붕귀 [men-tal-boong-gwi] (mental breakdown)! And 뭐라고 [mwo-ra-go]? (What did you say?) lol
Jajjeng na jinjja Really annoying
Mind your own business- neo na jalhae
Daebak !!
Saranghae ^^
이상해 i-sahng-hay
진짜 really

aigoo
fighting
oppa
shibal
I usually say ; 세상에 (sesang-e) which means 'what in the world' or 'oh my god' but only for fun with my sister. 
^ NABSHYO. XD (I randomly belt that out at times lmao)

I currently like: "Kuronikka....wae gabburo?" - from Voice. // 그러니까 왜 까불어? // something like "so why you acting up?" xD
"기가 막히네"
"치사하게"

I just like hearing it though... XD 
Chincha
and noon karara, if I am right (from gogh's starry night)
and all the common expressions.....