Fuckin' brains, brawn and brass balls
I cut em off and got em pickled and bronzed in a glass jar

from Eminem (Ft. Hailie Jade) – My Dad's Gone Crazy Lyrics on Rap Genius

Meaning

He can dis anyone with brains (smarts), brawn (muscles), or brass balls (confidence)

This line is doubly-clever, because
1) plenty of guys say they’re so tough they must have brass balls, but Em is tougher than all them because he’s man enough to cut off his own nuts with a chainsaw
2) His balls are already brass — how many folks are going to be able to tell the difference if he has them bronzed?? (Wikipedia says the only difference between brass and bronze is the amount of zinc & tin they contain…)

He’s making fun of beefcake guys who try to be the toughest, but are such numbskulls that they end up embarrassing themselves instead…

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