TBM commonly stands for True Believing Mormon or True Blue Member. It means they are "all in" and do not give space for questions or doubts. It would be rare for a member to call themself a TBM, but it's more in talking about others or used in the past tense, like "My parents are total TBMs" or "Before I left, I was a TBM".

Profiles self-identifying as TBM on the mormon spectrum:

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