The definition of Fortnite Kid is a person or thing that uses Fortnite pfps talks trash about other games plays Fortnite 24/7 and is generally cringe, they also don't shower very often.
Words used by Fortnite Kids: Trash, Dogwater, Cracked, Minis, Bigpot, ETC
Typically some cringy kid running the skin loadout of harley quin/star wand and the superhero pay-to-win skins, calling you bad at the game and using using the clown emoji, laugh it up emote and take the L, usually spotted on creative 1v1s and usually tends to have no gf or social life