one who is really weird and/or goes crazy (is obsessed with) a certain thing/person
YOU SEX FIEND!!

mmm, my girl is such a cock-fiend... i love it!
by say what? February 18, 2003
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(verb) To scrounge desired items by any means necessary.
(noun) A person who implements the verb form of fiend.

Mike: Dude, its cashed.
Fiendy McFiend: Fuck you, there's at least two more hits in that!

Mike: Ew dude, stop fiending the morsels of my bread crust.

Mike: Holy shit, that guy rounded up like twenty asians to fiend the answers for that math test.
by MattDC November 22, 2005
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a person who is exceptionally distraught when unable to acquire the drugs he is craving
oh my god, dude, quit crying. we'll get you some pot later
by vexator February 19, 2003
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n. a person who is extremely addicted to something ; an addict

"Can't believe she became an an opium fiend."

"I tongue kissed a coke-fiend at the afterhours."

by Miss. Devine February 16, 2009
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a devotee or user of whatever is indicated
The sex fiends in the room above are always keeping me awake at night with the sounds of their antics.
by Light Joker August 1, 2005
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Something or someone cruel, inhumane or wicked.
The fiend Wizard challenges you to his dungeon.
by Valoons December 8, 2015
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a meth like desire for something. To really crave something or someone
I am fiending for that guy right now.

I am fiending for some perk right now.
by .that's what's up. October 18, 2009
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