Definition of fink noun from the Oxford Advanced Learner's Dictionary

 

fink

 noun
noun
BrE BrE//fɪŋk//
 
; NAmE NAmE//fɪŋk//
 
(informal, especially North American English)
 
jump to other results
an unpleasant person Word Origin late 19th cent.: of unknown origin; perhaps from German, literally ‘finch’, but also a pejorative term. Students started to refer to non-members of fraternities as finks, probably by association with the freedom of wild birds as opposed to caged ones. The term was later generalized to denote those not belonging to organizations such as trade unions.
See the Oxford Advanced American Dictionary entry: fink