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1.
another term for a homosexual man
That guy was checking you out, Fred. He might be an ass mechanic.
by kingsvillian August 12, 2005
 
2.
(N) A proctologist; a doctor that specializes in disorders of the anus, rectum, male prostate gland and lower gastrointestinal tract.
When the ass mechanic stuck his finger in Bob's poop chute, he moaned another doctor's name. He's been regretting it ever since!
by Grue December 30, 2003