don't I know it en · INTJ
Etymology
A rhetorical question.
Meanings
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(informal) I know; I am very familiar with it (some stated fact).
"Here's your shirt," said Slippery. "Make it snappy, we're late." "Don't I know it," replied the Owl, emerging from the closet with his dinner jacket and vest[…]
1927 April, Boys' Life, page 16: