"Totally" is an adverb commonly used in informal language to express complete agreement or emphasis. It signifies that something is absolute or without any doubt. For example, if someone says, "I totally agree," they mean they fully support the statement or opinion being discussed. In addition to agreement, "totally" can also describe the extent of a situation or feeling. For instance, saying "I am totally exhausted" indicates a high level of tiredness. This word is often used in everyday conversations, making it a popular choice among speakers of English.