it means "liar".
je prends mon petit déjeuner is 'I'm taking my breakfast' in English.
dejeuner: To eat lunch.
If you mean Chickasaw, it is a tribe from the northern parts of Mississippi and Alabama and parts of Tennessee with their language. Some say the word derives from an English term meaning "rebel" but...
"This" is refering to a thing, item, etc. being indicated.