bob: hey, did you hear about how fred's house got bulldozed over while he was on vacation?  joe: yeah, he's going to have a cow when he finds out
as in when a person will be extremely upset, angry, or suprised about something
"bob: hey, did you hear about how fred's house got bulldozed over while he was on vacation?  joe: yeah, he's going to have a cow when he finds out" What is the definition of "have a cow"?