I tried searching in jisho.org with different iteratons of the オ to no avail.

Thanks in advance. [![enter image description
here](https://i.stack.imgur.com/JBDF9.jpg)](https://i.stack.imgur.com/JBDF9.jpg)
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question
meaning contractions anime
What does ガッポォオォイ mean?
Googling **ガッポォオォイ** led me to this page:

[ガッポォオォイ！JR秋葉原駅構内で...](https://blog.goo.ne.jp/omaketeki/e/3effb9bbbb5fe99a130a6e0fbd0d258c/?img=f070a19c73f932d6331d595b6998af17)
which gives this explanation:

> **ガッポォオォイ** ！（※ **学校っぽい** の略）

**っぽい** being a common suffix, some kind of slang expression added to convey
an idea of "similarity" or "likeness", often translatable as "-like" or "~ish"
in English...

Examples:

  * 学校っぽい (school-like)
  * 子供っぽい (childish)
  * 熱っぽい (feverish)
  * 安っぽい (cheap-looking)
  * 水っぽい (watery)
  * 滑りっぽい (slippery)
  * 色っぽい (sexy/erotic)
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answer
As others have answered the `ォオォ` part is only to transcribe the elongation of
the preceding `ポ` (it could be written `ガッポーーーイ` instead to the same effect),
so the "actual" word you're looking for is `ガッポイ`.

`ガッポイ`, to most people1, will refer to a schoolyardish "game" typically played
by boys. It consists in managing to slide one's hand between an "adversary"'s
legs, from behind, and raising one's hand up against their crotch while
shouting 「ガッポイ！」, slightly [akin
to](https://matome.naver.jp/odai/2139321045591450101#2142897950599738703) the
[カンチョー](https://en.wikipedia.org/wiki/Kanch%C5%8D) prank.

Here however, it seems to be a word peculiar to this series (「僕のヒーローアカデミア」)
and a [screen
annotation](https://twitter.com/thukihimiandao/status/1228598824265900032?s=20)
in this very scene spells out that it is, in this setting, meant as a
contraction of `[学校]{がっこう}っぽい`.

`っぽい` indicates something that has a strong component of (or similarity to)
what it suffixes (so here, `[学校]{がっこう}`). In other word, `[学校]{がっこう}っぽい` would
designate something very "[
**schooly**](https://en.wiktionary.org/wiki/schooly#Adjective)", or peculiar
to school. It wouldn't make much sense out of context, but it seems that in
_My Hero Academia_ the characters, while being students, spend a lot of time
fighting and don't often perform activities typical of a traditional school
environment, and since they've just been anounced a [cultural
festival](https://en.wikipedia.org/wiki/Cultural_festival_\(Japan\))
(「[文化祭]{ぶんかさい}」） (which is an event very typical of a school environment in
Japan) would take place, they shout `ガッポイ！`, which thus could be translated to
something like _"How schooly!"_.

[Source (jp) with illustrations](https://xaircraft.jp/heroaca-gp)

* * *

1. The blog post I cited as [source](https://xaircraft.jp/heroaca-gp) hypothesises that the series creator may have chosen to make up this particular word because he wasn't aware of the existing "real life" `ガッポイ` game.
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answer