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An athletic supporter, such as a jockstrap or a plastic cup, that protects the male genitals ("junk") against impact or injury.
"That football hit me right in the crotch! If not for my junk armor I'd be singing soprano now."

by al-in-chgo March 08, 2010
anything that protects the genital area, particularly for use against unwanted contact.
"Dude, when I had that threesome, that guy's junk was touching mine. Eww, I should have worn my junk armor."
by The Orchid Queen January 19, 2008