Verb: To borrow something with every intention of giving it back but never having done so.
Books, CD's, hedge trimmers, etc. Not to be confused with theft. The intent is the all important catalyst to using this word correctly.
"Where did you get that? I didn't know you owned one of those!"
"I don't! I borranged it from a neighbour."
"why didn't you give it back?"
"He moved house. Don't know where."
"Who lives next door now?