What does 'skylarking' mean? Is it an idiom?

[ElGatos]

Test No. incompl/advan-49 "Up in the Clouds", question 9

He just wouldn't take anything seriously and could always be found playing about and generally sky..........

(a) larking
(b) joking
(c) playing
(d) birding

Test No. incompl/advan-49 "Up in the Clouds", answer 9

He just wouldn't take anything seriously and could always be found playing about and generally skylarking.

Correct answer: (a) larking

Your answer was: incorrect
He just wouldn't take anything seriously and could always be found playing about and generally skyjoking.
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What special expression is that? I don't understand "skylarking".

[Alan]

This means playing about/not taking anything seriously.
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English as a Second Language
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