This short exclamation has circulated as a shareable reaction clip rather than as part of a longer recording, which is why it is usually encountered on its own in edits and message threads. The word kerel is Dutch and Afrikaans slang for a guy or fellow, so the phrase functions much like saying oh boy or oh man in English. Online, that familiar, slightly exasperated tone has made it useful across languages, with creators lifting the single line to comment on surprises, mistakes and awkward reveals without needing any extra context.