On your J's

On your own, by yourself.
From cockney rhyming slang, 'Jack Jones = Own'

My friends were busy, so I went to the movies on my J's.

Who wants to go to the museum today?
Not me mate, you're on your J's.

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By your J's

On your own

Oh shit man, dese hench SB brers caught me by my J's an fucked me up.

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Being on your j's

Being alone
Being by yourself

"We don't like you being on your j's, so we'll just come with you."

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J your D

to masturbate as a male

Alright guys, I'm gonna go get some lotion and J my D.

You look stressed man, you should go J your D.