ガッ

See ぬるぽ#Etymology.

• IPA^(key): [ɡa̠ʔ]

ガッ • (ga') 

1. (Internet slang, onomatopoeia) An expression of pain after being hit on the head; the traditional response to ぬるぽ.
   • 2017, これがマストドンだ！ [Mastodon is here!]‎, マストドン研究会 [Mastodon Research Society], Tokyo: Impress Co., Ltd., →ISBN, page 36:

     久(ひさ)しく忘(わす)れていたインターネットがここにある。[…] 今(いま)から20(にじゅう)年(ねん)ほど前(まえ)の2(に)ch(ちゃんねる)やI(アイ)R(アール)C(シー)の雰(ふん)囲(い)気(き)だ。[…] 我(われ)々(われ)はぬるぽにガッされ、ゴノレゴが吉(よし)野(の)家(や)のにわか客(きゃく)に文(もん)句(く)を言(い)い、ペリーに開(かい)国(こく)を迫(せ)りミキコにピアノを教(おし)えるあの空(くう)気(き)が再(さい)現(げん)されていた。そうだ。

     Hisashiku wasureteita intānetto ga koko ni aru.[…] Ima kara nijū-nen hodo mae no Ni-channeru ya Aiārushī no fun'iki da.[…] Wareware wa nurupo ni ga' sare, Gonorego ga Yoshinoya no niwaka kyaku ni monku o ii, Perī ni kaikoku o seri Mikiko ni piano o oshieru ano kūki ga saigen sareteita. Sō da.

     The internet I had long since forgotten is here. [...] The one with the atmosphere 2channel and IRC had twenty years ago. [...] The one where to "nurupo" we answered "gah!", we complained as did Gonorego about Yoshinoya's customers, we watched Commodore Perry angrily try to teach a struggling Mikiko to play piano. Yes, that internet has re-emerged.

• Usually written in halfwidth kana as ｶﾞｯ.

• ぬるぽ (nurupo)