FIESTAR's Jei, Cheska, and Cao Lu are back to teach you another Korean slang in the fifth lesson of their new series, 'FIESTAR's A-HA!'.

SEE ALSO: FIESTAR gives overseas fans a lesson on the word 'jjal'

The girls taught you about the Korean word 'daebak', 'deuktem', 'tteokbap', and 'jjal' last time, and they're following up with a lesson on the word 'doljikgu'. 

As the girls explain it in three different languages, 'doljikgu' is a combination of 'dol' which means rock and 'jikgu' which is a baseball term for a fast ball. Just like a rock that is thrown towards you like a fast ball, a 'doljikgu' is used when a blunt and straightforward remark is thrown at you.

Learn or review the slang 'doljikgu' and listen to a bit the girls' "A-HA! Song" above!