That watch is very cheap; it probably fell off the back of a lorry.
Эти часы очень дешевые; вероятно, они были украдены.
Definitions
A phrase used, especially in British English, to humorously or euphemistically suggest that something was acquired in a suspicious or possibly illegal way, such as being stolen. It implies the item was obtained without proper authorization, as if it 'fell off the back of a lorry' (truck) during transport.