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Definition hashtag in British English

hashtag noun

[countable] noun
/ˈhæʃˌtæɡ/
1

a word with the symbol # in front of it, used especially in social media and microblogging to identify or search for subjects of interest

Synonyms and related words
1.1

used to make a humorous point when speaking by pretending that what you are saying is a hashtag

Example

I can't find a wireless connection ... hashtag first-world problem.

Synonyms and related words
Definition hashtag in British English