The phrase "wert up up" may initially seem nonsensical, but its spelling can be explained through IPA phonetic transcription. "Wert" is pronounced as /wərt/, with a silent "e" and a short "u" sound. "Up" is pronounced as /ʌp/, with a short "u" sound and a voiceless "p" sound. However, the repetition of "up" suggests emphasis or intensity, which is why the word is repeated. Ultimately, the spelling of "wert up up" is a unique and playful way of expressing enthusiasm or excitement.