Sick-Fever is when you have a bangin' hangover which is caused by substances other than alcohol. Typically the effects of sick-fever last many days and will mean you need to pull a coupla sickies at work and do some yoga to work out whats what.
Hitting up the local coffee shop for a some hotties is a typical cure for sick-fever, or an extended break to byron, Australia to do some moon staring has also been known to work in certain cases.
Blimey, Jaime's had sick-fever all week! must have been been from that loose festival over the weekend.
Bro, i have fully got sick-fever, i wore contacts on my eye balls for 4 days straight due to how loose i got.