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Thoroughly or completely. That team underestimated us, and we beat them but good. My mother always notices every speck of dust in my house, so I was sure to clean it but good before she came to visit.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
severely; thoroughly. She told him off but good. Joe beat up Bill but good.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Emphatically, thoroughly, as in Ruth decided to clean up the whole yard but good. The word but in this colloquialism functions as an intensive. Also see and how.
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.
Informal Used as an intensive: The pipe started to leak but good.
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.