🖕 is one of those emoji that are pretty much self explanatory. You can’t expect to understand more about an emoji when you see something like this. Despite being self explanatory, this emoji can also be used to prank people or to troll them, depending on the situation. Most of the time though, people use this to insult or to be rude to a person.
Despite the fact that it might seem like an old emoji, 🖕 is actually quite new and it became a part of the Unicode 7.0 in 2014. Its name at that time was Reversed Hand with Middle Finger Extended. This sounds really strange considering how simple the emoji is and looks, but it goes to show that even definitions for emoji can be very strange and quite uncomfortable at times.
Should you use this emoji? Of course, if that’s the type of emotion you want to share with others. That’s why this emoji was created in the first place. But as you can imagine, this is not a very common emoji and a lot of people don’t really use it due to that.