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1.
This is the written form of a snort of laughter. It has also been known to mean nasally laughter (such as if one has a cold), but this is a less common use.
Person 1: (genuinely funny joke)
Person 2: hahaha ghagha
Person 1: What the.. Are you alright?
Person 2: Sorry, I snorted with laughter...
by Pedantic bakery April 11, 2010