マジで草

• 読み: マジでくさ
• ローマ字: maji de kusa
• 発音: /ma.dʑi.de.kɯ.sa/

意味

A combination of 'seriously' and 'LOL' — expressing that something is genuinely hilarious.

マジで草 combines マジで (maji de, seriously/for real) with 草 (kusa, the laughing term from www looking like grass). Together they express that something is so funny the speaker is genuinely laughing. It is more emphatic than 草 alone — adding マジで emphasizes that the laughter is real, not just polite. Very common on Twitter/X, YouTube comments, and texting. Can also be written as まじで草 in all hiragana.

例文

1. 犬が自分のしっぽ追いかけてるのマジで草。
2. あの動画マジで草だから見て。
3. 先生が黒板に書き間違えてマジで草だった。

使い方ガイド

場面: texting, social media, YouTube comments, online chat

トーン: amused, emphatic laughter

正しい言い方

• マジで草ｗｗｗ (Seriously LOL)
• それマジで草なんだけど (That's genuinely hilarious)

避ける言い方

• 目上の人に「マジで草」は失礼 (Saying 'maji de kusa' to superiors is rude — say 面白いですね)

よくある間違い

• Not understanding 草 means laughter — newcomers may be confused by 'seriously grass'
• Overusing マジで草 to the point where it loses its emphatic quality

起源と歴史

Combination of マジで (seriously, from 1990s youth slang) and 草 (LOL, from 2010s internet culture where www resembles grass). The compound became standard in 2010s-2020s online communication.

文化的背景

時代: 2010s-present internet culture

世代: Teens to 30s

社会的背景: Universal online casual

地域メモ: Used across all of Japan. One of the most common emphatic laughing expressions in modern internet Japanese.