expression
something-something; something or other
Casual placeholder used when the speaker cannot or does not want to specify details, similar to 'blah blah blah' or 'whatchamacallit'.
彼はうんちゃらかんちゃらと言い訳ばかりしている。
He keeps making excuses like 'something-something' and never gives a straight answer.
うんちゃらかんちゃらで結局何が言いたいのかわからなかった。
With all that 'something or other', I couldn't figure out what he really wanted to say.