Top Definition
When a woman is on her period and you go down on her butt hole and she poops in your mouth so you spit in into her vagina.
she was on her period so i went down on the dirt road and she farted and pooped in my mouth so i got mad and spit it into her vagina. thus the Rusty Lunchbox.
by didyurgirlfriend May 28, 2011
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