When you have a side girl or girl that is under 5'3 and weighs 100lb or less and their easily carriable wherever you go. Their very convenient for a quickie.
John: I used Sarah my Human pocket pussy after a long day of work to let off some sexual frustration of looking at all these 8+ girls.
David: Damn, maybe i need one of those to.
A pocket pussy is what is used when a man is too lonely and horny. The man usually can not find a women so he goes to a pocket pussy. Best known as a fake vagina. They come in many shapes and sizes. I even believe women might buy one to practice the oral sex. Pocket pussies are always a last resort and if your friend uses one, well find him what ever he prefers. Man or women.
After Jimmy was denied from his date he went home to his sad apartment with whom he shares with Fred. Fred then says "date go bad man? " and Jimmy replied "So bad that I have to use my pocket pussy tonight"