How to say "s/he gave me an earful!" in Spanish (Día 99)

The video tutorial introduces a Spanish phrase used when someone is harsh with their words. It provides a contextual example involving a scenario where someone is scolded. The phrase 'Medijo asta de Loque Merima Mori' is translated to 'they told me even what I was going to die from,' indicating the severity of the scolding. Alternative English expressions are provided, such as 'he didn't hold back' and 'he gave me a mouthful.' The tutorial concludes by encouraging viewers to use the phrase in conversation.

In what situations might someone use the phrase 'gave me a mouthful'?

Why might someone find the phrase discussed in the text to be fun or interesting?