When someone (usually a girl) plans on shacking with someone of the opposite sex, but doesn't want the other person to know she planned on staying over, she packs strategic items in her purse, such as a contact case, make-up remover, toothbrush, maybe even flip flops.
"I planned on strategically shacking, and it worked--he had no idea I had my contact solution and toothbrush in my purse!"
by Sporgan May 3, 2006