Learn the tone, meaning, and better English alternatives around "i've been in" with real scene examples.

It means the speaker believes they can tell when someone is pretending or not being truthful.
From Collateral Hearts, Episode 40
Someone is saying they have enough experience to recognize when another person is lying or bluffing.
Use this when you want to challenge someone's credibility. It can sound sharp or intimidating, so it is better for arguments or negotiation than polite conversation.
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