2PHRASE [PHRASE after verb](货物等)来路不明,是老鼠货,是贼赃 If someone says that something has fallen off the back of a lorry, or that they got something off the back of a lorry, they mean that they bought something that they knew was stolen. (货物等)来路不明,是老鼠货,是贼赃 [British, informal]
He gets caviare that has fallen off the back of a lorry.
他能弄到来路不明的鱼子酱。
Pete once bought the boys a bicycle cheap off the back of a lorry.