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English word just kidding comes from English just, English kidding
just (English)
(degree) absolutely, positively. (sentence adverb) Used to reduce the force of an imperative; simply.. (speech act) Used to convey a less serious or formal tone. (speech act) Used to show humility.. By a narrow margin; closely; nearly.. Exactly, precisely, perfectly.. Moments ago, recently.. Only, simply, merely. Factually right, correct; factual.. Morally right; upright, righteous, [...]
kidding (English)
(agriculture) The act of a goat giving birth.. The action of the verb kid.
just kidding (English)
(informal) I wasn't serious; it was only a joke.