One of the mysteries of the English language finally explained.
In the cuisine of El Salvador: a thick maize flour tortilla filled with various ingredients before being fried.
1940s; earliest use found in Denton (Maryland) Journal. From American Spanish (El Salvador) pupusa tortilla made with maize or rice flour and filled with pork cracklings, cheese, or other ingredients from Pipil pupu:sah (ultimately from Nahuatl popōtzoā to puff out, thicken, swell), the tortilla being so called on account of its shape.
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