Nibing or Nibbing: How To spell?
The word Nibing is misspelled against Nibbing, which is present continuous of "Nib"
Nibbing has double "bb" is mispronounced as "b"Remember double 'BB' in between the strings Ni & ing which should not be misspelled with single 'B'
Wrong Spelling:  Ni-b-ing  Correct Spelling:  Ni-bb-ing 
Find more wrongly spelled words of Nibbing to spell it well.