Legit (adj.) is in the dictionary as slang for legitimate or as a trained voice in opera or classical tradition.
Legit in the Urban dictionary is defined as real, and not fake.
Yes "de" is in the dictionary. It means of in French, Spanish and Portuguese. !
Totally means entirely; wholly; completely. The American Heritage Dictionary of...
Dictionary: A book containing a selection of the words of a language. Got another...
"A" is actually the first "word" in the dictionary, "Aardvark" is the second word.