Another way of saying "That better not be true". Usually used as an exclamatory statement after hearing something displeasing.
Mayor: "Because of the hurricane, it is possible we will be without power for a few weeks."
Disgrunted Citizen: "I know not!"
Disgrunted Citizen: "I know not!"
by AnnieF83 September 1, 2021
Get the I know notmug. by Williwonkaaaaa February 8, 2022
Get the I know like hellmug. Person 1: How many muscles is in a cats ear?
Person 2: I don't know.
Person 1: Do you have summer plans?
Person 2: I don't know.
Person 2: I don't know.
Person 1: Do you have summer plans?
Person 2: I don't know.
by Shakespearerocks February 10, 2024
Get the I don't knowmug. by SuelTameOresuTeMato May 2, 2025
Get the <.7.9.7.6.>I Did Not Know SHopping Carts MEant "'Shart'"<.7.9.7.6.>mug. THIS IS WHEN YOU KNOW SOMETHING IS TRUE, BUT PEOPLE DON'T BELIEVE YOU THEN COME BACK AND TELL YOU , THAT YOU WERE RIGHT AND YOU REPLY "I KNOW NOTHING".
by #LadiBonnie#794969 December 13, 2019
Get the I KNOW NOTHINGmug. 
