When you go down on a girl while she is having her period.
I'm red boxing Michelle tonight, I am not getting enough iron in my diet.
by Studentoflife13 January 03, 2018
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Red box is basically a giant red box at grocery stores and mcdonalds restaurants were you can rent movies for a cheap price.

Red box also can refer to a very severe sexually transmitted disease (STD) for women.
I dont want to buy a movie, lets go down to Micky D's and rent a movie from the Red Box.

Damn, did you hear Sandra got Red-Box from going to that party last weekend. Who knows what and who she did!!
by Deeez Nutzzz May 12, 2009
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A phrase to describe a slutty/loosy-goosy girl.

Just like a Red Box movie, she's: cheap, you use her for one night, and then you return her the next day.
Oh that girl last night? Yeah... she was a Red Box girl. Returned her this morning. Actually, cheaper than a Red Box movie, I didn't even have to pay $1!!
by The Oriental Express October 13, 2010
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