Gazillion/ɡəˈzɪljən/ Definition 1 of 1Pro Tip 1/3Informal Expression Used in casual conversation, not in formal writing or speeches. She's got a gazillion friends on social media. Pro Tip 2/3Not a Real Number It's an exaggeration to express a very large number without being specific. I've told you a gazillion times not to leave the door open! Pro Tip 3/3Indicates Impatience Sometimes used to show that something has happened too often or taken too long. You're taking a gazillion years to get ready!