The pig is an animal that is not associated with anything good. When you call someone a ‘pig’, you mean one of two things: he eats a lot and is therefore extremely fat, or he is very dirty. The expression ‘to pig out’ is normally used in informal contexts to mean, ‘to eat or drink too much’.
*On Sundays, the students from the hostel go to the city and pig out on pizzas and burgers.
Source: ‘Know Your English’ ( The Hindu) – September 25, 2007
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