Learn German: Er ist so ein unverschämter Barista! - He is such an outrageous barista!

In everyday German, so ein (and its other forms like so eine) is the most natural way to translate "such a". While solch ein means the exact same thing, it sounds very formal and is mostly used in written texts.

Why does the adjective unverschämter end in -er here?

This is a classic adjective ending rule. It describes the masculine noun Barista in the nominative (subject) case. Because the indefinite article ein doesn't have its own ending to show the masculine gender, the adjective takes on the strong masculine ending -er to do the job.

The word Barista ends in "-a". Doesn't that usually make it a feminine noun?

Usually, yes! However, Barista is a loanword from Italian. Because it refers to a profession, its grammatical gender often matches the person being talked about. Since the sentence starts with Er (he), we know we need the masculine form (der Barista), which is also reflected in the masculine adjective ending.

What is the literal meaning of unverschämt?

The core of the word is Scham, which means "shame". Adding the prefix un- and the suffix -t turns it into an adjective literally meaning "shameless". In everyday use, it translates to "rude", "insolent", or "outrageous", perfectly describing someone who acts completely out of line without any sense of embarrassment.