Fortniting is when a male is so high while having sex, that when he eventually ejaculates all over a woman's face, the man screams 200! Like what fortnite players say when they do maximum damage while hitting a headshot in fortnite.
It is a noun explaining a very intellected individual with a high IQ in the video game called "Roblox Battle Royale"
He is also a really professional Fortnite player.
Abdullah: Yo I got destroyed by fortnitegamer12as!
Bob: OMG fortnitegamer12as IS THE BEST! He destroyed TBE_NaTuRe.
i-MIEV: fortnitegamer12as hop on Fortnite, and carry me in duos.