Meaning of TwiHai(ツイ廃)

“TwiHai(ツイ廃)” is an abstraction for “Twitter(ツイッター) Haijin(廃人)”.
“Haijin(廃人)” means a disabled person.
So “TwiHai(ツイ廃)” means a person who is addicted to Twitter.
This is an internet slang.

Example Conversation

A: This guy tweets over a hundred times everyday…
B: Oh, he is TwiHai(ツイ廃)…

A: この人毎日100回はツイートしてるみたい…。
B: やばいね、ツイ廃だね…。