Green’s Dictionary of Slang

t.u.i.f.u. n.

[orig. usage, abbr. the ultimate in fuck ups]

(US) a terrible blunder.

Viewpoint Online Issue 362: 13 Mar. 🌐 A colleague writes to tell me of Bill Bryson’s book ‘Made in America’, in which reference is made to ‘snafu’ and a few of its confreres like ‘tuifu’ and ‘fubar.’ Bryson will have nothing to do with the pussyfooting versions favoured in these pages.
S. Dutch ‘Printing’ on University of Wisconsin 🌐 These were just a few of a host of World War II acronyms, including: [...] tuifu: the ultimate in f***-ups.