An epithet used for one who has gone crazy. Taken from Mega Man Maverick Hunter X for PSP.
Flame Mammoth: Bwah hah ha! There's nothing I love more than stomping weak little blabbermouths like you into dust!
X: That settles it...You're definitely a Maverick!
Spark Mandrill: X... You showed up.
X: Spark Mandrill. Do us both a favor and surrender peacefully.
Spark Mandrill: I don't think so, X. Oppose me and I'll crush you!
X: Sounds like you've gone Maverick. Your time has come, Spark Mandrill!
Dude: Hey man, gimme some dope.
Guy: How much you got?
Dude: Five bucks. I'll pay ya the rest later.
Guy: That's it, you've definitely gone maverick!
"Omega Pirate, most powerful of the Elite Pirate Forces. Omega Pirate can become invisible to normal sight. It is vulnerable when cloaked, as all energy is drawn from defense systems. By exposing itself to Phazon, it can regenerate damaged tissue and organs. Considered the pinnacle of the Elite Pirate program, this enemy should be handled with extreme caution and maximum firepower." - Log Book Excerpt from Metroid Prime