das Blabla
blah blah
Colloquial expression for empty, trivial, or nonsensical talk.
Ich habe keine Lust mehr auf sein ständiges Blabla, er soll endlich zum Punkt kommen.
I’m tired of his constant blah blah; he should finally get to the point.

blah blah
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blah blah
Colloquial expression for empty, trivial, or nonsensical talk.
Ich habe keine Lust mehr auf sein ständiges Blabla, er soll endlich zum Punkt kommen.
I’m tired of his constant blah blah; he should finally get to the point.

'Blabla' (blah blah) is an onomatopoeic word. It imitates the sound of talk that is perceived as empty and meaningless. The repetition 'bla-bla' reinforces this impression.
Er redet und redet, aber es ist alles nur Blabla.
He talks and talks, but it’s all just blah blah.
This word clearly belongs to colloquial language and has a derogatory, negative meaning. It is used to dismiss another person’s speech as unimportant or annoying.
Ich habe sein politisches Blabla satt.
I’m fed up with his political blah blah.
'Blabla' (blah blah) is an uncountable noun and is almost always used in the singular without an article. It often appears in short, evaluative sentences like 'Das ist doch nur Blabla!' (That’s just blah blah!).
Spar dir dein Blabla und sag, was du wirklich willst.
Spare me your blah blah and say what you really want.
nonsense
'Quatsch' and 'Blabla' can both refer to something that has no real meaning or no value. 'Quatsch' is broader: it can be a false idea, a silly statement, or nonsense in general. 'Blabla' mainly means empty or trivial talk, often a lot of words without important content. Learners may confuse the words because both can be colloquial and negative. If you mean nonsense in general, 'Quatsch' fits better. If someone talks a lot but says nothing important, 'Blabla' sounds more natural.

Für die Reise liest Johanna nur die wichtigen Hinweise und überspringt das ganze Blabla.
For the trip, Johanna reads only the important notes and skips all the blah blah.
Vor dem Wochenende erzählt sie in der Schule wieder nur Quatsch.
Before the weekend, she once again talks nothing but nonsense at school.