(US, African-American Vernacular) Indicates complete agreement.

(rhetorical) Indicates strong agreement with a preceding statement.

Third-person singular simple present indicative form of know any better

Synonym of know better

(chiefly upper Midwest US, informal) Used as a rhetorical question to confirm agreement, knowing or understanding at the end of a statement.

present participle of know which side one's bread is buttered on

present participle of know the difference between one's ass and a hole in the ground

(colloquial, set phrase, rhetorical question, often sarcastic) What a surprise; guess what? / Used other than figuratively or idiomatically: see what, do, you, know.

(rhetorical question) Implies that a statement is based on a guess or assumption rather than on knowledge or evidence.

To be extremely surprised by an event.