1
general::
Eat ravenously, gorge oneself, as in The kids pigged out on the candy they had collected on Halloween. [Slang; early 1970s]
American Heritage Idioms
2
general::
Phrase(s): pig out (on something)
Inf. to eat too much of something; to make a pig of oneself. • I intend to really pig out on pizza. • I love to pig out on ice cream.
McGrawhill's American Idioms And Phrasal Verbs