When a video or audio player starts playing automatically, it's called an autoplay. This means that the player will start playing the video or audio clip as soon as it is loaded.
To plummet is to fall rapidly and suddenly. When the stock prices fell, the market plummeted.
When someone is dwarfed, they are small and insignificant in comparison to other people. This can be a result of a number of things, like being shorter or having less muscle mass.
To pretend is to act or to look like something that you are not. When you pretend to be someone else, you are usually acting out a role that you have been assigned.
To tweet is to post a short message on Twitter. Twitter is a social media platform where people can post short messages about anything that is happening in their lives.
annoyingly means very annoyingly. Sometimes when you say something is annoyingly, you mean that it's really irritating.
To monetize something is to make it into a moneymaker. Sometimes this means turning it into a business that can be run profitably.