The phrase "wast on the up up" is an informal way of saying "you were improving." The spelling of "wast" is a historical form of the second person singular past tense of "to be," which is "were" in modern English. The IPA phonetic transcription for "wast" is /wɑːst/. The phrase "on the up up" is a colloquialism that means "on the rise" or "improving." The IPA phonetic transcription for "up up" is /ʌp ʌp/. Together, this phrase indicates that someone was making progress and getting better at something.