Definitions

1. noun

A slang term for a jack-o’-lantern, a carved pumpkin, especially one that is hollowed out and lit from within.

“The neighborhood kids made a big jacko for the front porch.”

2. noun

A colloquial term for a person who is considered to be a bit of a trickster or a prankster.

“He’s a bit of a jacko, always playing jokes on his friends.”