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1. Living in an untidy, dirty, or slovenly manner. I don't miss the days of pigging it with six other guys in a dinky student apartment.
2. Eating an excessive amount, especially of unhealthy food. As a nation, we've been pigging it for decades now, and it still seems to only be getting worse.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Live in a slovenly way, as in Ten roommates shared that small house, and as you might guess they were pigging it. [Slang; late 1800s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
To live in a piglike fashion.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.