A pick-up line is a phrase used to attract (pick-up) women (or men). This particular pick-up line is kind of funny but EXTREMELY vulgar. Be careful. Explanation: People commonly walk into furniture and bang (hit) their pinky (smallest) toes on the furniture. The humor here comes from the slang definition of the word 'bang,' which can also mean 'to have sex with someone.' Translation: I wish that you were my pinky-toe so that I could have sex with you on every piece of furniture I have, the same way I hit my pinky-toe on every piece of furniture (I have).

"To bang a toe", means to hit something with your foot. Your Pinkie toe, being on the outside, is particularly susceptible to this. "To bang" in a sexual slang context, means to have sexual intercourse with someone. Unless you knew the person well and were making a joke, this would go over like a lead balloon. :-)

"Bang" is another word for "have sex with". So the real meaning is, "Because I'd have sex with you on every piece of furniture I have."

This is a really bad pick up line, in my opinion.