Flopsweat – n. Theater. nervous perspiration caused by fear of failure before an audience. From “Random House Historical Dictionary of American Slang, Volume 1, A-G” by J.E. Lighter, Random House, New York, 1994. This earliest citation in this reference is: 1966 Susann “Valley of the Dolls” 292: The applause had been deafening on her entrance, but after ten minutes the air was heavy with “flop sweat.”

OK, let’s use it in a sentence (this line is what made flopsweat today’s word). Via the apostate Balloon Juice blog,

Unsurprisingly, practically everybody involved with the glorious clusterf*ck in Iraq has switched into desperate damage-control mode. Michael Leeden’s [sic] personal dodge (Supported the invasion? You must mean some other Michael Leeden) is particularly funny for its mix of mendacity and flopsweat.”