Final answer:
The phrase "FELL OFF THE BACK OF THE TRUNK/ GOT OFF THE BACK OF THE TRUCK [LORRY]" typically means acquiring something, often goods or items, through questionable or unauthorized means.
Step-by-step explanation:
This colloquial expression suggests obtaining items, possibly merchandise or goods, in a manner that may not be entirely legal or ethical. The phrase implies that the origin of the acquired items is dubious, possibly hinting at theft, unauthorized access, or involvement in the black market. The metaphor of falling off the back of a truck implies a surreptitious acquisition, as if the items were obtained through some illicit transaction or a less-than-honest arrangement.
While it is commonly used to describe obtaining goods without proper authorization or purchase, the phrase may also be used humorously to imply a lack of transparency in the acquisition process. It is important to note that the phrase is idiomatic and does not necessarily imply criminal activity in all cases; it can be used in a lighthearted or metaphorical context.