Shitrate is a noun used to describe a bitrate which is shit. It can be used to describe extremely low quality audio or video, or simply a very poor internet connection
Guy 1: Want to hop on Discord and play some video games with the boys?
Guy 2: Sorry bro, I can't even load Wikipedia with this shitrate ð
"I can't even tell what's happening in that video, what is that shitrateð"