You jast ate a fat buger aaaaaand you aint brush dem teets. A layer of a combination of left over foods and random things throughout the day that stay on your teeth and have the consistency of moss. You can scrape it off with your finger nails or the strongest muscle in your body... the tongue. (its actually the butt and thighs, but we wont talk about that)
Gal 1: damn my teeth moss is thicc today, it could last me all winter!
Guy 1: Really??!?!??! I just scraped all of mine off.