An exclamation expressing disgust, revulsion, or a gag reflex; the sound of someone retching.
Onomatopoetic in origin, representing the sound someone makes when disgusted or about to vomit. Similar to 'blah' or 'blegh,' these are modern informal expressions rather than historically ancient words.
Bleck is a perfect example of how English constantly creates new onomatopoetic words for modern communication, especially in texting and comics. You'll almost never see it in formal writing, but it's absolutely real in how young people actually talk.
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