piss oneself
Verb
Meaning
(UK, slang, vulgar, literally) To wet oneself.
(UK, slang, vulgar, figuratively) To be very scared (to the extent that one might lose control of one's bladder).
(UK, slang, vulgar, figuratively) To laugh uncontrollably (to the extent that one might lose control of one's bladder).
Source: en.wiktionary.orgSynonyms
terrified
piss
pants
trousers
petrified
die laughing
in stitches
wet oneself
shit oneself
roll in the aisles
brick it
shit bricks
pee oneself
split one's sides
brick oneself