shit oneself
Verb
Meaning
(vulgar, slang, literally) To soil oneself.
(vulgar, slang, figuratively) To be very frightened or astonished (to the extent that one might lose control of one's bowels).
Source: en.wiktionary.orgSynonyms
terrified
pants
shit
petrified
piss oneself
wet oneself
soil oneself
shit bricks
fill one's pants
crap one's pants
shit one's pants