To masturbate, to knock one off.
eg: One
'Man, i could do with a Josh, i'm so horny'
'Well, to Josh now would be nice, but you'll have to wait'
Or
eg: Two
Joe: 'Ahh, that Josh last night was mega'
Conor: 'I could really use one, I haven't had a Josh for quite some time.'
eg: Three
'Look at her! I'd give that a Josh!'
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