Plural of blimp; airships or dirigibles, or (slang) obese people.
From acronym 'B-limp' (British limp airship), or possibly onomatopoetic from 'blimp' sound; term emerged early 20th century for non-rigid airships.
The origin of 'blimp' is genuinely mysterious—possibly a WWI acronym, possibly just the sound of an airship, yet it became both a technical term and eventually a slur, showing how words' social meanings drift.
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