When you scrape something, you take a little bit of it off. Scrapings are the little bits that you take off when you scrape something.
Scrapings are usually seen as small and not very important.
Examples:
She used a knife to get the chocolate scrapings off the bar.
The cook collects the vegetable scrapings to make soup.
He found some wood scrapings on the floor.
The cat licked up the fish scrapings from the plate.
I found some ancient cave scrapings on the wall.
The child made art with the crayon scrapings.