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.
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Words nearby but good
Example sentences from the Web for but good
As an example of good science-and-society policymaking, the history of fluoride may be more of a cautionary tale.
The speaker conjures up centuries of collective sagacity, aligning oneself with an eternal, inarguable good.Politicians Only Love Journalists When They're Dead|Luke O’Neil|January 8, 2015|DAILY BEAST
I think everybody would like to be handsome and good at karate.‘Archer’ Creator Adam Reed Spills Season 6 Secrets, From Surreal Plotlines to Life Post-ISIS|Marlow Stern|January 8, 2015|DAILY BEAST
Petty, shade, and thirst are my favorite human “virtues” and the trifecta of any good series of “stories.”‘Empire’ Review: Hip-Hop Musical Chairs with an Insane Soap Opera Twist|Judnick Mayard|January 8, 2015|DAILY BEAST
Finding a smuggler in Ventimiglia is easier than finding good food.
We resolved to do our best to merit the good opinion which we thus supposed them to entertain of us.
And with some expressions of mutual good-will and interest, master and man separated.The Posthumous Papers of the Pickwick Club, v. 2(of 2)|Charles Dickens
She did not need a great cook-book; She knew how much and what it took To make things good and sweet and light.
The Seven-score and four on the six middle Bells, the treble leading, and the tenor lying behind every change, makes good Musick.Tintinnalogia, or, the Art of Ringing|Richard Duckworth and Fabian Stedman
Those in whom the impulse is strong and dominant are perhaps those who in later years make the good society actors.Children's Ways|James Sully