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1.
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!'
by E-W-THE-GINGER June 16, 2009