Green’s Dictionary of Slang

Band-Aid n.

[brandname Band-Aid; the US equivalent of the UK Elastoplast]

(orig. US milit.) a doctor; thus Band-Aid (wrapper), an ambulance.

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[US]L. Dills CB Slanguage 6: Band-Aid/Band-Aid Wrapper: ambulance.
[US](con. 1970) J.M. Del Vecchio 13th Valley (1983) 591: Band-aid: A medic.
[US](con. 1960s–70s) G.R. Clark Words of the Vietnam War 46/2: Band-Aid see Combat Medic.

In compounds

Band-Aid liberal (n.) [note the Band-Aid rock concerts of 1982, which themselves punned on the name Band-Aid + SE band + aid]

a half-hearted liberal, whose beliefs can be easily compromised; such an individual would rather place a Band-Aid on an issue and cover it up than dig into the roots and deal with it; also attrib.

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M. Nguyen ‘It’s (not) a white world’ at WorseThanQueer.com 🌐 It’s a popular ‘band-aid’ liberal response to structural inequalities, something akin to ‘love sees no color‘ or ‘I have black friends’.