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1.
Insanely awesome or cool.
Yo bro that was chainy.
by =ToT= December 31, 2008
 
2.
Colloquialism for chainman or chainperson

A Land Surveyor's useless assistant of whom is unfortunately necessary for the day to day operation of land surveying practices.
Hey chainy, go and sharpen my brush hook.
by another disgruntled surveyor January 19, 2011