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1.
Somebody who excels in a certain field, above average. Also can mean just simply awesome.
"Wow, he gets all the chicks bro."
"Yeah man, he's a chick specialist."
by Tstylez January 16, 2009
 
2.
A rank in many modern militaries, especially the United States military, that is above private 1st class and below corporal (Army) in some instances.
Frank was a specialist in the Army.
by Nicolaivich January 19, 2004
 
3.
(n.) Someone who is special.
"Look at him trying to run with cramp in his leg; he looks like a specialist."

"I'm so glad I met you girl; you're my specialist."

Q: "He always just seems to sit there staring gormlessly. What does he bring to the team? What does he specialize in?"
A: "Being special."
by jannerick August 12, 2009
 
4.
Someone who is prejudiced against the mentally disadvantaged.

From special needs.

Derived from special in the same way as racist and sexist are from
race and sex.
Stop calling my sister a spack you fucking specialist.
by Mtilda Morris August 17, 2005