The correct spelling of the phrase "wast slanted" is "was slanted." The word "was" is pronounced /wʌz/ in IPA phonetic transcription and is the past tense of "be." On the other hand, "wast" is an obsolete pronunciation of "was" in some dialects, particularly in Middle English. The word "slanted" implies that something was tilted or sloped. Therefore, the correct phrase means that something was tilted or sloped at a previous time.