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Kieuk (character: ㅋ; Korean: 키읔, romanized: kieuk) is a consonant of the Korean Hangul alphabet. It is pronounced aspirated, as at the beginning of a syllable and as [k] at the end of a syllable. For example: 코 ko ("nose") is pronounced , while 부엌 bueok ("kitchen") is pronounced .
Slang usage
In South Korean internet slang, the use of ㅋ (short for 크; keu) indicates laughter. Similarly, ㅎ (short for 흐; heu) is a lighter laugh than ㅋ. Either ㅋ or ㅎ can be repeated a number of times to this effect.