In the literal sense, something that's cheesy is something with a cheese-like flavor, such as Cheez-It's, Smartfood Popcorn (drool) and Cheetos.
However, at least in the US, it has an idiomatic meaning as well. If something is cheesy, it is lame, corny or half-assed.
Examples of cheesy things include:
etc...
Chees"y (?), a.
Having the nature, qualities, taste, form, consistency, or appearance of cheese.
© Webster 1913.
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