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An acronym for Sort of Giggling A Little But Not Really. The appropriate response to use in text or instant messaging to something marginally funny, but not actually hilarious enough for a laugh irl. A replacement for lol when not actually laughing out loud.
John: I just ran into my exgirlfriend.
Jane: Did she say anything to you?
John: She said hey.
Jane: sgalbnr...
by jetaimeleplus November 20, 2009
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