no ifs, ands, or buts (about it)

no ifs, ands, or buts (about it)

1. Without a doubt or reservation. We're definitely going to lose our jobs after this merger, no ifs, ands, or buts about it.
2. Absolutely no excuses, discussion, or protestations (about something). I don't care how, but you make sure you're at your son's party tomorrow—no ifs, ands, or buts about it! No ifs, ands, or buts—just do as I tell you!
See also: but, no
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

ˌifs and/or ˈbuts

(often used in negative sentences) used to stop somebody arguing, protesting or making excuses when you tell them to do something: I want this work finished by Friday and no ifs and buts.
See also: and, but, if
Farlex Partner Idioms Dictionary © Farlex 2017

ifs, ands, or buts

Reservations or restrictions; excuses. This expression actually mingles two older ones, ifs and ands with but me no buts. The first, dating from the sixteenth century, was more or less the equivalent of wishful thinking, and its most famous version is Charles Kingsley’s rhyme of 1850: “If ifs and ans were pots and pans, there’d be no trade for tinkers.” Almost as old is “but me no buts,” meaning make no objections or excuses, which according to Eric Partridge was popularized by Sir Walter Scott’s use of it in The Antiquary (1816). The current cliché is most often used as a negative imperative, as in, “I want this done by tomorrow, and no ifs, ands, or buts.”
See also: but
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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