dumper

What it means

1. A small vehicle often used to carry loads and material around, often on building sites; a dumpcart.
2. A dropper of refuse, particularly not in landfill or recycling sites.
3. One who dumps a boyfriend or girlfriend; the one of a romantic couple who terminates the relationship.

In a sentence

The choice of a dumper can be disastrous for a comparatively unskilled surfer […]

1959, John Bloomfield, Know-how in the Surf, page 28

Where it comes from

From dump + -er.