Etymology 1 
This definition is lacking an etymology or has an incomplete etymology. You can help Wiktionary by giving it a proper etymology.
Alternative forms 
fub (third-person singular simple present fubs, present participle fubbing, simple past and past participle fubbed)
- (transitive, obsolete) To put off by trickery; to cheat.
- a. 1599, William Shakespeare, Henry IV, Part 2,
- A hundred mark is a long score for a poor lone woman to bear : and I have borne, and borne, and borne ; and have been fubbed off, and fubbed off, and fubbed off, from this day to that day, that it is a shame to be thought on.
Etymology 2 
Compare fob a pocket.
fub (plural fubs)
- (obsolete) A plump young person or child.
- (Can we find and add a quotation of Smart to this entry?)
Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.