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.
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*
When I ran out of pot, I got crazy-like yo', I was fiending... But now that I'm addicted to crack, all I can ever do is run around all crazy-da-bomb like super-yo'! and feen, I'm like feenin' all the time now...