To Go Mad
To Go Crazy
intransitive verb, godan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means lunatic or crazy. The verb version of this is to go mad (you don't really "go lunatic" now, do you?) or to go crazy.
To remember the reading, just think about how when you go crazy, you are coming (来る) to crazy town. Just imagine some voice beckoning you to come. Come here! Please come here! Come to crazy town! Give in to the voices!
「サーモン、今週末、ラスベガスで結婚しよう。」「フグ、気でも狂ったの？」
"Salmon, let’s get married in Las Vegas this weekend." "Fugu, have you lost your mind?"