Meaning of “Otakatsu(オタ活 / ヲタ活)”

“Otakatsu(オタ活 / ヲタ活)” means Otaku activities.
“Ota(オタ/ヲタ)” is an abbreviation for Otaku(オタク / ヲタク).
“katsu(活)” is an abbreviation for Katsudou(活動) meaning activities.
Every action for your favorite something which makes you “Otaku” is “Otakatsu(オタ活 / ヲタ活)”.

Example Conversation

A: What are you doing on your day off?
B: I’m busy for Otakatsu!
A: Oh, but now, there’s no live show, right?
B: No problem, I can pay on online events!!

A: いつも休みの日何してるの?
B: ヲタ活にいそしんでるよ!
A: え、でも今ライブないんじゃないの?
B: ライブ配信で課金できるから大丈夫!

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