Top Definition
Doing heroin intravenously in the style of Robbie Williams. See also rock the mainline.
From Robbie Williams' "Rudebox":

"Ok then check the tan line
Make your body shape
Like you're stood on a landmine
Call me on my mobile
Not the landline
And jack the mainline
At the same time"
by Some Fresh Money September 07, 2007
6 Words related to Jack the mainline

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