To have the features of an elf- pale skin, closely cropped hair, high forehead and, most importantly, eyes which slant upwards.
Elfin people come only from Nordic countries.
"Freddie Ljungberg is looking very Elfin today".

Q. "Is he Czech?"
A. "No Iclelandic, elfin".
by L.B.Seed August 22, 2004
having elfish qualities
"imagine that kid with long hair. he'd look elfin"
by ginjanut March 28, 2010
To go out with the intention to pick up and have sex with members of the opposite sex who are of limited height. The use is similar to how the word "hogging" can be used to describe a similar act with members of the opposite sex who are overweight.
by Emily (another one) September 29, 2005
When you wear your socks halfway off your feet so they hang off your toes like elf shoes
Homie#1: “Ey dawg you finna rock tha house shoes?
Homie #2: “Nah son I’m elfin’ it today”
by Wattstradamus October 28, 2019
A euphemism to be used in polite company in place of the vulgar adverb "fucking"
Merry elfin Christmas to you too you asshole!
by Jacked Up Jazz December 21, 2006
Participating in or viewing porn involving elves or elf like beings.
by Emily from St. Paul! September 3, 2003
"Elfin" is a condition when a bar is full of all these dorky and squirelly white men and NO women.
"Forget this place - it's totally elfin!"
by El Loudo February 9, 2005