ボキャ貧 (ぼきゃひん, bokyahin) would be the last thing that the readers of this website want to be.
If someone is ボキャ貧 (ぼきゃひん, bokyahin), that means they have a poor vocabulary and only use rudimentary words. In particular, it describes those who always resort to very casual and versatile words such as “やばい” and “すごい”. It is also often used in self-deprecating humour.
ボキャ貧 consists of the two parts “ボキャ” and “貧“. The former stands for “ボキャブラリー”, a loan word from “vocabulary” in English. The kanji character 貧 generally means “poor”, as in “貧しい” meaning “poor” and “貧困” meaning “poverty” . Therefore, ボキャ貧 indicates someone who has a poor vocabulary.
A: How was the party yesterday?
B: It was マジやばい (literally awesome)
A: You are ボキャ貧 (having a poor vocabulary), aren’t you?
Because I have a poor appreciation of food and a poor vocabulary, I can say nothing but “おいしい (tasty)” whatever I’m eating.
(Note) 味音痴 describes a person who cannot differentiate good tastes from bad ones. Here, 味 means “taste” and 音痴 means “poor at understanding”. However, when 音痴 is used as it is, it means “poor at singing”.
Synonyms: 語彙力がない （level of vocabulary is low）
Synonyms in English: have a poor vocabulary
Related words and phrases: ボキャブラリー (vocabulary), 貧 (poor)