no ifs, ands, or buts and no buts about it
no ifs, ands, or buts (about it) and no buts about it
Fig. absolutely no discussion, dissension, or doubt about something. I want you there exactly at eight, no ifs, ands, or buts about it. This is the best television set available for the money, no buts about it.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.