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1.
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
 
2.
.
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."

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by al-in-chgo March 08, 2010