A vagina.

Commonly used by an older person when speaking to a younger person about their gentials. Reason being, you carry it everywhere you go, it opens and closes and it's made to put things in and out of.
Don't forget to wash your pocket book, ya nasty little thing!!
by theboithatcould January 25, 2006
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Similar to pocket dial, pocketbook refers to any Facebook message, status update, etc. that is accidentally created as a result of your phone being unlocked while in your pocket.
Dude, wtf is this facebook message you sent me: "Ggggggghhhfk"???

My bad bro, I must have pocketbooked you.
by MississippiDave February 24, 2010
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