OK, so we know this is a controversial inclusion because there's an argument that says this isn't a word at all. However, we all know what we're looking at, and we've all heard it used in every day conversation. Since the beginning of social media, and even more so since WhatsApp became popular, there's rarely a day that goes by where you don't see at least one GIF online.
Because GIF is an acronym, standing for Graphics Interchange Format, you would expect it to be pronounced with a hard 'g' as "giff". However, if there's one person who should be given the right to decide how it's pronounced, it's Steve Wilhite, the computer genius who invented them. He pronounces it with a soft 'g', becoming "jiff". Who are we to argue with the man who made the internet funny?