It wasn't exactly the Father's Day Dustin Poirier had in mind ... the retired UFC legend was arrested early Sunday evening in Georgia, TMZ Sports has learned. Poirier, 37, was booked for "Public Drunk" -- a misdemeanor -- at 6:38 PM ... before being released several hours later, a quarter after 10 PM. It's unclear what led up to Dustin's arrest. On Sunday, Dustin reposted a "Happy Father's Day" post his wife shared with her followers on Instagram ... showing DP with his two children, and

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