stick your bib in

stick (one's) bib in

To involve oneself in an intrusive or nosy manner into something that is not one's business or responsibility. Primarily heard in Australia. I wish my neighbors would quit sticking their bibs in and just leave us alone! Liam, don't stick your bib in your brother's affairs—he can manage well enough on his own.
See also: bib, stick
Farlex Dictionary of Idioms.

stick your bib in

or

poke your bib in

AUSTRALIAN, INFORMAL
If someone sticks their bib in or pokes their bib in, they interfere in a situation or an argument. I wish he wouldn't keep sticking his bib in. Note: You can also say that someone sticks their bib into something. They want to limit the right of unions to stick their bibs into disputes where none of their members is actually involved.
See also: bib, stick
Collins COBUILD Idioms Dictionary, 3rd ed.

stick (or poke) your bib in

interfere. Australian & New Zealand informal
See also: bib, stick
Farlex Partner Idioms Dictionary
See also:
  • poke (one's) bib in
  • stick (one's) bib in
  • put (one's) nose (in) where it's not wanted
  • put (one's) nose in(to) (something)
  • put nose in
  • put one’s nose in
  • put one’s nose in where it’s not wanted
  • stick (one's) nose in(to) (something)
  • stick one’s nose in
  • stick one’s nose in where it’s not wanted