The phrase "most high hat" is generally used as a figurative term to describe someone who is arrogant or pretentious. Some synonyms for this phrase include "haughty," "conceited," "snobbish," "overbearing," "superior," "egotistical," "pompous," and "uppity." These words all denote an attitude of superiority or self-importance and are often used to describe individuals who believe they are better than others. It's important to note that while these words may be synonyms for "most high hat," they don't necessarily share the same connotation or level of intensity. Each word has its own unique nuance and meaning.