Mouthful

[JPablo]

Random House gives this definition (4) for mouthful
4. Informal. a spoken remark of great truth, relevance, effectiveness, etc.: You said a mouthful!

What would be a good translation in Spanish for this specific meaning of "mouthful"?

(In the example I'd simply say, "¡Has dicho/dijiste una gran verdad!"

"Una verdad como un puño" is another option...

Any other ideas?

And if we say, That’s a mouthful but it’s true. probably it's not the same definition, but 5. a long word or group of words, esp. one that is hard to pronounce... although in my overall context seems like a combination of both meanings, 4 and 5...)

What do you think about "Eso es toda una parrafada, pero es una verdad como un puño"?

[Perikles]

mouthful seems to me to be used mainly in the sense of when somebody has been supressing their opinion and finally lets rip with a broadside of criticism. For example:

She was fed up with his coming home drunk every night, and finally she gave him a mouthful.

(This mouthful might or might not be the truth, just a strong opinion.)

For some reason, I find it natural to use she as the subject.

[JPablo]

That's rich, Perikles!

In that case,
ella le echó la bronca
or
ella acabó soltándole una parrafada que no veas...

(It reminds me a visual joke some friend sent me about 2 birds, and how to be able to know which one is the female and the male... If I find it I'll post it...)

At any rate, thank you!

[AngelicaDeAlquezar]

Bueno, en español, se seguiría relacionando con la palabra "verdad": "...y le dijo sus verdades".
(No necesariamente verdad como tal, sino una firme opinión)

[JPablo]

¡Gracias, Malila!

[aleCcowaN]

Según tengo aprendido hasta ahora:

decir una gran verdad
cantar cuatro frescas

[JPablo]

Gracias, AleCcowan!