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It's a made up word. A mix of "unbelievable" and "fucking" spelled as "fuhqing" since it looks less harsh and is pronounced the same as the word "fuck". Together it yields "unbefuhqinglievable".
Wow, another bastard to add to my list...people that start out as friends and turn into unbefuhqinglievable losers?!?

Words related to unbefuhqinglievable

believable believe unbefuckinglievable unbelievable