1
general::
Become crazy with excitement, as in The crowd went hog wild as soon as the band began to play. Why this expression should allude to the craziness of hogs is no longer known. [Colloquial; c. 1900]
American Heritage Idioms
2
general::
Phrase(s): go hog wild
Rur. to behave wildly. • Have a good time at the party, but don’t go hog wild. • The teacher cannot control a class that is going hog wild.
McGrawhill's American Idioms And Phrasal Verbs