An informal way of saying the word "totally" in conversation. The word itself, a separated compound, is designed to stress the pronunciation of the second syllable in "totally."
Greg, I must say, this sandwich is toetally awesome.
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!