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A true red head's unshaved (preferrably nicely trimmed) vagina. The color of her pubic hair = red e.g. rusty, and box = vagina.
I love my smokin hot red headed girl friends "Rusty Box"! Did you see that ginger at the strip club? She had an awesome "Rusty Box"!
by LytShow March 10, 2011
a red headed's vagina
Last night, I spent hours licking her rusty box.
by JoeMama420 March 08, 2011
Going down on the ass and not caring about the fecal matter that may be present.
Man, I totally rusty boxed my dude friend last night. Tasted great.
by mr_tl-606 July 13, 2011