A shortened version of "fiend" as in to fiend for
something, jonesing, jonesin' etc. Usually when so desperate for addictive substance that the "feen" or person "feening" doesn't have time to complete the pronounciation of words, let alone entire sentences. Abbreviated for fiend.
FIEND:
1 a :
DEVIL 1 b : DEMON c : a person of great wickedness or maliciousness
2 : a person extremely devoted to a pursuit or study : FANATIC *a golf fiend*
3 : ADDICT 1 *a dope fiend*
4 : WIZARD 3 *a fiend at
mathematics*