when someone get's quiet for a period of time because they don't quite know how to or want to respond to a comment or set of comments in a text or IM conversation. Hush Mouth Syndrome is this followed by a sudden change in topic
Guy: let's go to the movies this weekend
Girl: OK
Guy: what do you want to see
Girl: how about the new Twilight movie
10 Minutes of Hush Mouth Syndrome later
Guy: so how about those sorry azz cowboys
by Blu PainΣ December 01, 2010

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