(verb) The act of collecting various discarded and unwanted scrap metals and taking such precious metals to a scrapyard for a small but helpful monetary reward. Scrapping is oftentimes very hard and dirty work for a relatively small payoff.
Johnny had been unemployed for a stretch now and was struggling to find any decent work. He had lately taken to the toil and trouble of scrapping so he could at least keep his cigarette habit and continue smoking.
The saplings are a community of subscribers from a YouTuber called InTheLittleWood, also known as Martyn.
A "sapling" is what Martyn calls his subscribers.
Purchasing large quantities of goods (usually tickets) early with the sole intention of re-selling them at a higher price at a later date (closer to the event).