A riot is when a group of people publicly protest in a violent manner. They usually do so in the streets of whatever city the injustice they are protesting took place. The riot jokes in this section poke fun at things like stealing what you need from the store while people are rioting and looting all the local businesses. Things like the welfare office being untouched during the protests.
The most recent riots have taken place in Baltimore and Ferguson due to cops killing young black men so you will also see memes showing scenes from the riots and buildings that have been burned down as a result.
You will also find funny videos of things that have taken place during the riots, as well as white people celebrating sports victories that look almost, as if not more, brutal than the rioting that is currently going on.