Slang meaning for "Taking a morning constitution"

[Herma]

English Language Tests, Intermediate level

ESL/EFL Test #326 "English Slang Idioms (47)", question 1

That guy gets angry and talks back to the boss way too much. He'd better cool his ......... before he gets fired!

(a) toes
(b) fan
(c) jets
(d) head

English Language Tests, Intermediate level

ESL/EFL Test #326 "English Slang Idioms (47)", answer 1

That guy gets angry and talks back to the boss way too much. He'd better cool his jets before he gets fired!

Correct answer: (c) jets
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slang meaning for "Taking a morning constitution"?

Herma

[Mister Micawber]

'Constitutional'. Taking a walk.
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Native English teacher at Mister Micawber's

[Oinas]

Hi! What is the meaning of "cool his jets"? With kind regards,Oinas.

[Mister Micawber]

Relax; wait (sometimes impatiently)
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Native English teacher at Mister Micawber's