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Discover what hashtags mean, and add your own definitions in seconds.

Discover what hashtags really mean.

  • Enter hashtag or search phrase
Tip: Enter two or more words to search for hashtags that match these words. E.g. "2013 Conference"
Tagdef for other langauges: English Spanish Portuguese French German Indonesian Italian Dutch International

These apps currently integrate with Tagdef

Tagdef iPhone app - look up hashtags from your iPhone.
DuckDuckGo - The search engine with privacy protection.
Truthy-a research project that helps you understand how communication spreads on Twitter.
Solplay-A simple, modern way to search twitter.
Twittelator - the most powerful iPhone twitter-client.
Tagdef in Firefox (uses Greasemonkey)
Tagwalk - web-application for twitter-analysis.
Tagscroller - Open source jQuery plugin for showing hashtag definitions.