What does jinx mean?

[moony]

English Language Tests, Intermediate level

ESL/EFL Test #385 "English Slang Idioms (116)", question 5

"I love hanging out with your brother. That guy is hilarious! He's a ......... a minute!" Jane told Roxanne.

(a) smile
(b) jinx
(c) laugh
(d) downer

English Language Tests, Intermediate level

ESL/EFL Test #385 "English Slang Idioms (116)", answer 5

"I love hanging out with your brother. That guy is hilarious! He's a laugh a minute!" Jane told Roxanne.

Correct answer: (c) laugh
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what does jinx mean?

moony

[Mister Micawber]

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Do you have a DICTIONARY?
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber