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British English slang used to mean, "for the sake of it; for a laugh".
It is used to justify doing something (usually when pratting around) when there is no good reason - see examples
"Oi, play chicken when the headmaster comes along, just for jokes"
"ite, watch!"

"We was bored so we decided to play strip poker, just for jokes - Anna ended up completely naked"
by electrobeatz October 05, 2009