Adjective
scared shitless (not comparable)
(idiomatic, vulgar, slang) Very frightened, terrified.
The beginning of genius is being scared shitless. Louis-Ferdinand Céline
He introduced me to all the intellectuals at S. F. State and convinced me I should be a writer since I had so many fucking stories to tell. Little did he know I was scared shitless of all those guys with the tweed coats and fancy pipes. Oscar Zeta Acosta
In Milton Berle: An Autobiography, he explained, "I was scared shitless, even when he went on to tell me that Pauline would save my life. Source: Internet
In polite company this can be abbreviated as SOS. citation citation Surprise To shit oneself or to be scared shitless can be used to refer to surprise or fear, usually figuratively. Source: Internet