Half smiling and blowing air sharply out of the nose, usually brought on by a semi-funny yet very dumb text post on the microblogging website tumblr, or a situation that's ironically funny.
Person 1: *picks up donut* Look, I'm like one of the cops!
Two police officers look over at Person 1
Person 2: *blows air out of nose with a half smile*
Person 1: Oh stop tumblr laughing at me, will ya?
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