Coombies is an Aussie slang abbreviation of couldn’t be fucked or couldn’t be bothered.
An example is I’ve had the coombies all day. Meaning I couldn’t be fucked /bothered doing anything all today.

Bogans tend to say Coombies, with the meaning coombee fucked being to lazy to pronounce the word couldn’t be, therefore saying Coombee fucked/bothered/stuffed instead of I couldn’t be fucked/bothered/stuffed doing anything today.
by Aussie Slang May 10, 2018
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