IIABDFI

IIABDFI

An initialism for "if it ain't broke, don't fix it," meaning don't fiddle or interfere with something that is functioning just fine as it is. If the washer's working, you should text him IIABDFI so he doesn't bring his tools over and try messing with it.
Farlex Dictionary of Idioms.

If it ain’t broke don’t fix it

and IIABDFI
sent. & comp. abb. Leave well enough alone.; Don’t tamper with something that is all right as it is. It’s fine. Leave it alone. If it ain’t broke, don’t fix it!
See also: broke, fix, if

IIABDFI

verb
See If it ain’t broke don’t fix it
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • DFTT
  • DADT
  • Don’t make a federal case out of it!
  • bathwater
  • don't bet on it
  • don't cry before you are hurt
  • a thing you don't want is dear at any price
  • don't get me wrong
  • don't beat a dead horse
  • all in (one's) head