Top Definition
The overwhelming and sudden sensation of elation that washes over someone upon gazing at a particularly clever or insightful #hashtag on a social media posting (e.g., Twitter, Facebook, et al)
When I saw Sondra's tweet was hashtagged #whocaresaboutemailwhenthegiantsareintheseries I nearly had a hashtag-gasm! Go Giants!
by SA92663 October 29, 2010
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