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1.
Abbreviated slang for the word "brilliant"

Similar to other Australian abbreviated colloquialisms, such as;

1. "chrimbo", an abbreviated version of "Christmas"
2. "sambo", an abbreviated version of "sandwich"
The sun is out, I feel like it's going to be a brimbo day!
by kingofthen0rth August 06, 2014
 
2.
a brunette born with the brain of blonde
see i told you your so dippy its funny your such a brimbo ... you really should have been born blonde not brunette
by u clazy g September 17, 2012