furious
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to be furious with
A colloquial expression for being very angry or annoyed with someone.
Ich bin immer noch total pest auf ihn, weil er unser Treffen einfach vergessen hat.
I'm still totally furious with him because he simply forgot our meeting.
This adjective is used almost exclusively in the fixed construction 'pest sein auf jemanden' (to be furious with someone). The person you are angry with is always used with the preposition 'auf' and the accusative.
Sie ist pest auf ihre Freundin, weil sie nicht zurückgerufen hat.
She is furious with her friend because she didn't call back.
The expression is derived from the noun 'die Pest' (the plague, a serious disease). The imagery makes the intense anger clear—you are so annoyed that you could wish the plague on the person.
Nach dem Streit war er tagelang pest auf seinen Kollegen.
After the argument, he was furious with his colleague for days.
'Pest sein' (to be furious) is a very informal colloquial expression. You should only use it when talking with friends or in informal situations, not in formal emails or official conversations.
Sei nicht gleich pest, es war doch nur ein Witz!
Don't get furious right away, it was only a joke!
plague
For die Pest, the input supports only the colloquial expression „auf jemanden pest sein“, not the name of a disease. By contrast, die Seuche refers to a disease that spreads quickly and causes many victims. The supplied comparison involving diseases therefore cannot be explained by a suitable meaning of Pest.
Ich bin pest auf meinen Bruder, weil er mein Fahrrad genommen hat.
I’m furious with my brother because he took my bicycle.
Die Seuche breitete sich schnell in der ganzen Region aus.
The plague spread quickly throughout the entire region.
