1. Can't wait to find out!/Looking forward to it. (There needs to be some sort of reveal or finding out involved. It's not a good fit if you're "just" going to see someone.)
Meanings
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A thrilling look at the meanings of "Spannung" and the verb "spannen" and the answer to how to say ‘relaxed’ and ‘excited’ in German.
Vocab:
die Spannung, gespannt, spannend, die Anspannung, entspannen

Word Family
Root: *(s)pen-