Bobing or Bobbing: How To spell?
The word Bobing is misspelled against Bobbing, which is present continuous of "Bob"
Bobbing has double "bb" is mispronounced as "b"Remember double 'BB' in between the strings Bo & ing which should not be misspelled with single 'B'
Wrong Spelling:  Bo-b-ing  Correct Spelling:  Bo-bb-ing 
Find more incorrect spellings of Bobbing to spell right way.