Slubering or Slubbering: How To spell?
The word Slubering is misspelled against Slubbering, which is present continuous of "Slubber"
Slubbering has double "bb" is mispronounced as "b"Remember double 'BB' in between the strings Slu & ering which should not be misspelled with single 'B'
Wrong Spelling:  Slu-b-ering  Correct Spelling:  Slu-bb-ering 
Check more misspelled words of Slubbering to spell it correct.