Common [Trash-Talking] Phrases... They Are Like Memes or Something...
"I'm done" "I quit" "AFK" "So bad" "Stop feeding" "Report [XXXXXXXX]" "WTF [Champion-Name]" "This [Champion-Name]" "gg ez" "ez" "outplayed" (more like using some brainless broken-ass pick) "[Role/Lane] or feed" "That's why you're still in Bronze/Silver/Gold/Plat/Diamond" "Just push mid and end" "Why ?" "Report this duo/[Champion-Name]/bot-lane/[etc.]" "You're trash" "You deserve to be in [Ranked Tier]" "so easy" "FF@20" "Surrender at 20" "Surrender ?" "You just [describe what happened here]. How does that make you feel ?"
I know there's probably a lot more but some of these immediately come to mind as things that one is almost always guaranteed to be able to read in nearly every other match (particularly in ranked)...