凸する

• Reading: とつする
• Romaji: totsu suru
• Kanji breakdown: 凸 (convex/protruding) → visual metaphor for pushing/barging into something + する (to do)
• Pronunciation: /to.tsu su.ru/

Meaning

To raid, barge into, or unexpectedly join someone's livestream — often uninvited or as a surprise.

凸 (totsu) is used because the character visually represents something protruding or pushing forward. 凸する means to push yourself into a situation — most commonly joining a streamer's broadcast uninvited, calling in to a live show, or showing up at a location. In streaming culture, it can be friendly (surprise collab) or hostile (stream sniping, harassment). The opposite, 凸待ち (totsu machi), means the streamer is openly accepting call-ins. The term originated in gaming culture but spread to all streaming contexts.

Examples

1. 知らない人に凸されてビビった。 Some random person raided my stream and I freaked out.
2. 凸待ち配信するから誰でも来ていいよ。 I'm doing a call-in stream, so anyone's welcome to join!
3. あの配信者に凸したいけど勇気ない。 I want to raid that streamer but I don't have the guts.

Usage Guide

Context: streaming, gaming, online communities

Tone: aggressive, bold, or playful depending on context

Do Say

• 凸待ちしてるから気軽に来てね！ (I'm accepting call-ins, so feel free to join!)
• 急に凸してごめんね！ (Sorry for barging in unexpectedly!)

Don't Say

• 配信者が凸待ちしてないのに凸する (Don't raid a stream uninvited unless the streamer has said they're open to it)

Common Mistakes

• Not knowing 凸待ち (totsu machi) — the state where a streamer is openly accepting raid/call-ins
• Using 凸 without understanding it can imply unwanted intrusion if the target did not consent

Origin & History

From the kanji/symbol 凸 (totsu, convex/protruding), visually representing something pushing outward. Originally used in gaming (rushing/charging) on 2channel, it evolved to mean barging into a stream or broadcast. The term became standard streaming vocabulary in the 2010s.

Cultural Context

Era: 2000s gaming origin, mainstream streaming use by 2010s

Generation: Millennials and Gen Z

Social background: Gaming and streaming community

Regional notes: Used across Japan in streaming and gaming communities. The 凸 character is used because its shape visually represents pushing/protruding.