(informal) Used as a farewell, when the next time the speaker and interlocutor will meet is not known.

(Chinglish, Singlish) I don't know, how should I know

Synonym of I could eat a horse

Alternative letter-case form of I before E, except after C

(orthography, mnemonic) In English words that contain the letters I and E together, the I tends to come before the E (ie), except in cases when the two are preceded by the letter C, in which case the E comes before the I (cei).

A sarcastic response to when someone is told something obvious

Used to wholeheartedly agree with somebody else's remark

(idiomatic, impolite) Said to dismiss what the interlocutor is saying.

Asking how much money is to be paid for products or services.

(US, military, idiomatic, sometimes humorous) Used by senior enlisted military personnel to indicate that they are not commissioned officers.