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1.
Fjuck comes from the misspelling of the word "fuck". Normally misspelled when someone is extremely mad, and typing fast.
Omg taht FJUCKING noob!

Oh ya? WEL FJUCK YU!
by Darkcow153 June 25, 2005
 
2.
The way people from Iceland say fuck.
1. I told Bjorn to fjuck off.

2. Fridrik was fjucking Brynja in the room next to mine and it kept me awake all night...
by JB_Finesse December 01, 2005
 
3.
Usually a typo of the word Fuck, but usually meant to mean a Jump fuck. Make up your own conclusion.
what a wild fjuck
by r3L4x September 30, 2003