Why did I shart? Serious question

No this is not a troll question. I chugged a liter of water because I felt dehydrated. Not 15 minutes later I needed to toot so I let nature take its course and she surprised me with a shart instead. Wtf?! It was bright yellow as well, not a normal poo color. Could it have been caused by the water because this has never happened before
Why did I shart? Serious question
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