In a cheesy manner; in a way that is fake, overly theatrical, or of poor quality; also relating to cheese.
From 'cheesy' (meaning cheap or fake, likely from 1800s slang) + adverbial '-ly'. The 'fake' meaning emerged from 'cheap' associations and musical theater.
The word 'cheesy' for 'fake and overdone' came from B-movies and cheap productions that were literally made with low-budget tactics—the 'cheese' is like calling something 'corny' or 'hokey.'
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