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?!?
by Whose name starts with a "P" and ends with an "r"" April 16, 2007
The Urban Dictionary Mug
Can you define these popular missing words?