Related words 草 is internet slang representing laughter (from the look of repeated 'w's like grass), while ワロタ directly means 'I laughed'/'LOL' as a reaction.
笑う is the plain, neutral verb 'to laugh', whereas ワロタ is a slangy past-tense internet variant used specifically as an online reaction like 'LOL'.
ワロタ is plain internet slang for 'lol/laughed', while クソワロタ adds クソ as an intensifier for much stronger amusement.
Written forms ワラタ
Variant spelling with ラ instead of ロ ; less common but still used.
わろた
Hiragana spelling; used in casual online writing.
わらた
Hiragana variant with ら ; less common.
Etymology Internet slang based on わろうた , a colloquial or dialectal form corresponding to 笑った “laughed.” It became widely used online as an expression of amusement.
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