with (one's) jaw in (one's) lap(redirected from with his jaw in his lap)
with (one's) jaw in (one's) lap
In utter shock or great surprise, especially upon learning unexpected news. We sat with our jaws in our laps after we heard how much they were paying in rent. A: "I don't know about you, but hearing that they're having a baby left me with my jaw in my lap." B: "Same here. They've only been dating for about five minutes!"
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.