pronounced (bich_ˈpä-kət) (Street slang) The act of asking a girl for her number and then putting it in your pocket. Therefore you have put the bitch in your pocket. Moreover the female in question is now your bitch pocket.
Origins of the word date back to 2002 when first heard from Money Spitz, the creator of the word.
Yo what's good! Let's hit up the club and get some bitch pockets.
Nah, that ain't my girl that's my bitch pocket.