Addicts have a Jones for their drug or habit of choice. Some sports junkies have a Jones for baseball, others football, and still others cannot get enough NASCAR; some simply have a jones for ESPN and whatever is being shown at the moment.
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"
A incredibly cringe thought that clickbait and retarded youtubers upload for 6-12 year olds but should be 18 because they kill Minecraft Steve and that cannot happen