When having an impromptu sleepover at a buddies house, the act of taking a pair of your friend's clothes to wear the next day, then leaving him with your dirty laundry. A higher form of this is actually persuading the friend to forget about his clothes, therefore technically stealing them.
pat: thanks for the Clothing Swap man, you left all your dirty clothes at my house, my mom just washed everything.
jon: oh word. (i still have all of his clothes, i hope he forgets about them...)