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1.
Fusking is simply using a program to extract files names from a website that would seem obvious. Like 1.jpg, 2.jpg, etc.

For the record: These other definitions aren't "fusking" wrong, they're fucking wrong. If you're typing "s" where your "c" is... consider a keyboarding class, n00b.
Amber: Oh hey Nikki, what are you gonna do tonight?
Nikki: I'm gonna try fusking in our friend's private photobucket for pictures they wouldn't want us to see.
by HailyaEnjoi May 26, 2009
 
2.
intentional typo for "fucking", usually
to avoid filters.
In reply to your post, you are fusking lame.
by scarry_harry May 10, 2008
 
3.
Another way to say "fucking"
Theres no fusking way im going to dunk my toes in that mayonaisse.
by virus January 28, 2005