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1.
Used as a contracted form of "F*cken Bugs" - or if you're conservative, as "Friggin' Bugs".

Many words can be appended with the discrete F-bomb with this simple appendage, not quite a prefix.

Even the pronunciation Fbugs.
Spammers who copy a former comment and use it as their own for a backlink - that shit fbugs.
by Gray Hat SEO Guy October 14, 2010