Definition of はんかくカタカナ
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(n) half-width katakana
半角カタカナをインターネット上で使っていろんな所にいけば、いつか顰蹙をかいまくる事になるよ。
If you go around the Internet, using half-width katakana in various places, eventually you're going to end up pissing off a lot of people.