What did Udhayanidhi Stalin say on actress Trisha that led to his arrest?

DMK leader Udhayanidhi Stalin was arrested after allegedly making a double-meaning remark on Trisha while targeting Tamil Nadu CM Vijay. During a speech, Stalin alleged that TN hadn't received a single drop of Cauvery water. As someone from the public shouted "Trisha", Stalin replied, "Even...if water doesn't come to our place, water must reach there. That's all he cares about."