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1.
Australian slang for someone under the influence of chemical substances.
"look at Mitch he's off chops!"
de Dylan 12 juin 2004
 
2.
an interchangeable expression that is used to describe something 'awesome' or 'cool'. Often used when elated or excited over a specific happening or event. Can also be capatialised 'OFF CHOPS' to depict higher elation.

Often confused with the less awesome 'off the chops', used to signify one's ability to never get laid.
"Bro, how was last night with the missus"

"Esh lad, It was OFF CHOPS"
de Esh Romberg 30 septembre 2011
 
3.
Australian idiom usually expressed after dropping a good pill or after smoking/injecting some quality meth.
Man that's good gear I'm off chops.
de blind sponge 7 avril 2011
 
4.
To be off ones chops. i.e shitfaced
I had to call offchops the other night
de Ben Waterson 21 novembre 2008