expression
clap clap; good job
Internet slang used to applaud or praise someone, similar to typing 'clap clap' or 'well done' in English. Derived from the onomatopoeia パチパチ (clapping sound).
See also: パチパチ
テスト満点だったよ！→８８
I got a perfect score on the test! → clap clap / good job
新作のイラスト、すごくいいね。８８
Your new illustration is really great. 88 (clap clap)