终于知道为什么外国人这么少了…

Meaning

Internet slang, mostly used for teasing. "干了你" (f**k/kill you) can be understood as "🦈了你" using shark emoji. Originated from "三天之内🦈了你" (I'll 🦈 you within 3 days) and "我要🦈了你" (I'm gonna 🦈 you). The shark emoji euphemistically replaces aggressive words like "kill" or "f**k".