Crock

The full expression is crock of shit but the abbreviation crock is generally more acceptable in public media. It is American in origin and dates from the 1970s, whereas crock is an Old English word (before 1150) for a pot or jar, to which the word crockery is related. During the 19th century, an old crock was dialectical for broken, worthless crockery and was frequently applied to broken down old animals, people and things, as indeed it still is today.