at noon yesterday.
Origin of yesternoon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for yesternoon
Historical Examples of yesternoon
Everybody has run away and I havent had anything to eat since yesternoon!The Life of Ludwig van Beethoven, Volume III (of 3)
Alexander Wheelock Thayer