Kieuk

Kieuk (character: ㅋ; 키읔) is a consonant of the Korean Hangul alphabet. The Unicode for ㅋ is U+314B. It is pronounced aspirated, as at the beginning of a syllable and as  at the end of a syllable. For example: 코 ko ("nose") is pronounced [kho], while 부엌 bueok ("kitchen") is pronounced [puʌk].

Slang usage
In South Korean internet slang, the use of (short for ) indicates laughter. Similarly, (short for ) is a lighter laugh than. Either or  can be repeated a number of times to this effect.