Abbreviation of japanese expression Chotto Mate which is the informal version of Chotto matte kudasai
It basically means Wait for a bit.
In other situations it could be translated as 'no', because some japanese people use it to say no in the least offensive form possible.
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Chomama is basically another term for big boobs because Arisa Ichigaya has big CHOMAMAS.
Chomama originated from the song "I-I Never Said Love!" By Arisa Ichigaya from the series BanG Dream!
Chomama = Big Juicy Thicc Japanese Oppai
Holy shit those CHOMAMAS ARE THICC!
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