The phrase "gat out of way" is an informal way to tell someone to move out of the way quickly. It could also be interpreted as an impolite or rude way of demanding someone to make space. If you want to use a more polite and formal alternative to "gat out of way", you could say "Excuse me, please" or "Pardon me, may I pass?" Additionally, you could use the phrase "make way" which is a more formal synonym for "gat out of way". It is always important to be respectful and courteous when needing to get past someone, especially in crowded public spaces.