Crackajack

[krak-uh-jak] /ˈkræk əˌdʒæk/

noun, adjective
1.
.

modifier

: He estimates that a crackerjack examiner working under optimum conditions would find 10 to 15 percent of his cases to be inconclusive/ I’m a crackerjack story teller

noun

A person or thing that is remarkable, wonderful, superior, etc: Signorelli is a crackerjack

[late 1880s+; origin uncertain; perhaps a fanciful extension of cracker in the mid-19th-century British sense ”something approaching perfection,” which is also reflected in terms like crack shot, crack troops, etc, and based on an echoic expression of speed; hence also cracking; the term is reinforced in the US by late 19th-century trademark Cracker Jack for a popcorn and peanut confection]

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Crack a joke
Make a joke, say something humorous, as in You can count on Grandpa to crack a joke on every occasion. This expression uses the verb to crack in the now obsolete sense of “briskly pronounce” or “boast.” [ Early 1700s ]
Crackberry
/ˈkrækˌbərɪ/ noun (pl) -ries 1. (informal) nickname for a BlackBerry handheld device that functions as a telephone, PDA, and e-mailer and appears to have an addictive hold on its users noun a person who uses a BlackBerry handheld computer addictively or obsessively; also, the BlackBerry when used this way Word Origin 2000 Usage Note slang
Crackbrain
[krak-breyn] /ˈkrækˌbreɪn/ noun 1. a foolish, senseless, or insane person. /ˈkrækˌbreɪn/ noun 1. a person who is insane

Crackbrained
[krak-breynd] /ˈkrækˌbreɪnd/ adjective 1. foolish, senseless, or insane. /ˈkrækˌbreɪnd/ adjective 1. insane, idiotic, or crazy adjective Crazy; eccentric; wild; crackpot (1634+)
Cracked
[krakt] /krækt/ adjective 1. broken: a container full of cracked ice. 2. broken without separation of parts; fissured. 3. damaged; injured. 4. Informal. eccentric; mad; daffy: a charming person, but a bit cracked. 5. broken in tone, as the voice. Idioms 6. cracked up to be, Informal. reported or reputed to be (usually used in […]