expression
something or other; what-do-you-call-it
Used as a placeholder when the speaker cannot recall or does not want to specify a name or thing. Casual and colloquial.
あの、なんたらかんたらって店、知ってる？
Do you know that, uh, what-do-you-call-it shop?
expression
blah blah blah; yada yada yada
Mimics or dismisses someone's speech as meaningless or tedious. Often used to summarize or mock what someone said.
彼はなんたらかんたら言い訳ばかりだ。
He just keeps making blah-blah-blah excuses.