get the flop sweats

informal To perspire heavily due to intense anxiety, embarrassment, or nervousness, especially related to the fear of public failure. I really wish I could do something so that I don't get the flop sweats every time I have to give a presentation in work. Haley has a great voice, but she gets the flop sweats any time she has to sing in front of people. Oh man, when my jokes don't land with an audience, I definitely start to get the flop sweats up there.