Fortnite
Fortnite:

/ˈfɔ tnʌɪt/
noun: A type of cancer, mostly caused by playing the online game "Fortnite". Fortnite is a cancer mostly appearing in 12 year old children and of course in other people of all ages, an alternate cancer which is very similar to Fortnite is Ligma. Something puzzling for scientists is how parents are not realizing that their children are diagnosed with a deadly cancer.
Mother: Doctor, my son has Fortnite!

Doctor: Calm down, ma'am, but this may be fatal.