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1.
When you ram the f*ck out of a girl with your fingers.
(Can be acompanied with chainsaw noises)
"I took that girl to the junk yard last night"
"Yeah i junk yarded the f*ck out of her"
"I'm going to junk yard someone so hard tonight, il be covered in blood"
"I'm junk yarding tonight"
by P-biggy February 01, 2008
 
2.
To fully cup another man's genitals with one's hands.
"Stop junkyarding me, you perv!"
by Jay Jacks January 10, 2008