expression
something something; something or other
A colloquial placeholder used when the speaker cannot or does not want to specify exact words, similar to 'blah blah' or 'whatchamacallit'.
彼がほにゃららと言ってたけど、よく聞き取れなかった。
He said something or other, but I couldn't catch it well.
ほにゃららの部分は後で書き直します。
I'll rewrite the blah-blah part later.