A name for a person being, goofy, silly, crazy or spontaneous. May also apply if a day is going badly or a class was not very fun. May be used as a noun, a verb or an adjective.
1. Bry: Dude, that one guy on the plane... did you see him? His hand was all over the inside of his jeans and then he just... sprinted to the bathroom...
Reek: Yeah, he was a real cacklejack, alright.
2. Reek: I can't believe he left a used condom at our door. What kinda retaliation for a joke is that?
Birr: None at all. He's just a dumb cacklejack.