When you've achieved/are capable to achieve something beyond compare. Usually followed by the words "don't worry," this phrase is to ensure your peers that you have potential to execute a task properly. Derived from the original phrase, "I've Got it," or "I Got it."
Man 1: Do you really think you can take all those muggers on by yourself?
Man 2: DON'T WORRY, I GAT IT.
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Boyfriend: Babe, can you make me a sandwich really quick?
Girlfriend: DON'T WORRY, I GAT IT.
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Announcer: And first place goes to.. the Red team!
Red team: (in unison) I GAT IT!!!!!!!!
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