Are you denying it, Groink?
Or are you saying that you don't know if it was, or what?
He's asking you to provide proof for your assertion.
def·i·nite·ly
ˈdefənitlē/
adverb
1.
without doubt (used for emphasis).
"I will definitely be at the airport to meet you"
synonyms: certainly, surely, for sure, unquestionably, without doubt, without question, undoubtedly, indubitably, positively, absolutely; More
in a definite manner; clearly.
"we couldn't plan to go elsewhere until we had heard from you more definitely"