The story
From belly + scraper. * (earthmoving heavy equipment): From having a blade that scrapes the ground on the bottom "belly" of the vehicle.
Etymology from Wiktionary, CC BY-SA 4.0.
bellyscraper
Today it means: A piece of earthmoving equipment used to level land and build roads. A heavy equipment machinery with a blade on the bottom and a hopper on top, that can carry, scrape-up, and lay-down material. Full definition →