Scots ~ Verbal confirmation that a statement that someone else has said is wholly true and accurate.
isny - present tense - Eng. Isn't
wisny - past tense - Eng. Wasn't
Justin: Look at the size of that house. It's massive!
Martin: Aye! It isny half!!
Justin: Wow! That explosion was so loud!
Martin: Aye! It wisny half!!