Australian slang for the designated driver — the person in the group who volunteers (or draws the short straw) to stay sober and drive everyone else home safely after a night of drinking. Short for 'designated driver' via 'desig' to 'deso,' it's a very Australian compression. Being the deso earns you social credit and the eternal gratitude of your mates, even if it means a night of sipping lemonade while everyone else gets loose.
Jake was the deso this weekend, so the rest of them could finally let loose at the footy after-party.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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(AU, slang) A designated driver.
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