Mexican breakfast

Supposedly because it is all that Mexicans can afford.

• Audio (General Australian):

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Mexican breakfast (plural Mexican breakfasts)

1. (idiomatic, US) A breakfast consisting of a cigarette and a glass of water.

• Eric Partridge (2005) “Mexican breakfast”, in Tom Dalzell and Terry Victor, editors, The New Partridge Dictionary of Slang and Unconventional English, volume 2 (J–Z), London, New York, N.Y.: Routledge, →ISBN.