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1.
Stands for "half-hearted nose laugh". This is what you say when something is funny, but only funny enough for an almost snort and definitely not funny enough for an lol.

Used on twitter as #hhnl.
M@ewm@x: ...that awkward moment when you go to get a coat from your closet and you find Narnia instead
35173_1337: hhnl
by eliseypants January 24, 2012