when a chick is clean of any STD's
i've never heard of that chick puttin out she has to have a safe deposit box
by d-town slacker July 6, 2009
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The person who you trust with your life, who you tell all your secrets and is not you're boyfriend. A safe deposit box will keep all your secrets saf and is a very honest person
Me and Jessie were best friends, she was my Safe deposit box
by cheetahguy44 January 18, 2012
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A person whom you trust your life's secrets with. However, a safe deposit box can not be your girlfriend/boyfriend. It is a good idea to be eachother's safe deposit box. Any one person may not have two safe deposit boxes.
Me and Ethan are best friends, he is my safe deposit box.
by cheetahguy44 January 19, 2012
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Where the most sexually rewarding, explicit, fulfilling, and indulging sexual encounters and or memories are retained in the mind for the most anticipated and pleasurable masturbation sessions.
example1:

Tom: hey bro, remember when you and i ran the train on that Holly Lolly girl from the Sunset Tan show?

Jon: yeah man, i have that shizzle stored in my Spank Bank Safe Deposit Box

example2:

Matt: hey bud, did you end up hooking up with that horny, drunk blonde chick that was all over you last night?

Steve: Nahh dawgg, before we left to my place she passed out in the bathroom, i had to bring out old memories from my Spank Bank Safe Deposit Box that night as a pathetic attempt to even come close to the amount of pleasure that i was so close to getting...
by gingabreadman186 December 17, 2008
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