Definify.com
Webster 1913 Edition
Dabster
Dab′ster
,Noun.
 [Cf. 
Dab 
an expert.] One who is skilled; a master of his business; a proficient; an adept. 
[Colloq.] 
☞ Sometimes improperly used for dabbler; as, “I am but a dabster with gentle art”. 
Webster 1828 Edition
Dabster
DABSTER
,Noun.