Subscribing to someone’s Twitch stream for 9 months in a row is often jokingly called a “sub baby” or “Twitch baby,” referring to the number of months in an average pregnancy.
*Twitch notification: a_username has subscribed to Streamer123 for 9 months!*

Streamer123: “Hey, thanks for sticking around nine months! It’s a sub baby!”
by Tomi V. August 11, 2021
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