Yeah~ 여친 is sort for 여자친구 which means Girlfriend :P

Thx to both of u! Funny words these 엄친아, 엄친딸... ^^

There're some words like that, e.g. 엄친아 = 엄마 친구 아들, 엄친딸 = 엄마 친구 딸. They means the good example which constantly irritates you.

yes it is "여친 for 여자친구"