wet one's pants

Etymology
The senses referring to laughing and being afraid are extensions from the literal (urination) sense; both involve an element of variably literal or figurative nature: they are generally figurative, but if one laughs hard enough or gets frightened badly enough, the wetting may sometimes happen literally.

Verb

 * 1)   To wet oneself, to urinate in one's clothes while wearing them.
 * 2)   To laugh uncontrollably.
 * 3)   To be afraid; especially, to be extremely afraid.
 * 1)   To laugh uncontrollably.
 * 2)   To be afraid; especially, to be extremely afraid.
 * 1)   To be afraid; especially, to be extremely afraid.