cracked up

1. cracked up to be . Reputed to be. This expression is always used in a negative way, as in I don't think this book is all it's cracked up to be . It relies on the now obsolete use of to crack up to mean “to praise extravagantly.” It appeared in The Kentuckian : “He is not the thing he is cracked up for” (May 28, 1829). [Early 1800s]

2. Under the influence of crack (a form of cocaine). For example, “Who's cracked up, who's cracked out, and who's dead?” ( World News Tonight , ABC-TV, May 12, 1992). [1980s]

3. Past tense of crack up .