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A vehicle that is so frequently used for sex, that the interior is walled with semen.
Kate Upton is usually found in Drew's slag wagon.
by guy wacking to kate upton June 17, 2011
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Not your average slag, will take it anyplace, anywhere, anytime with anyone maybe everyone at once.
That slagwagon took micky up the arse and his mate jim up the front last night at the same time
by Frank Curran March 05, 2005
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Any taxi, car, minivan, motorbike, hovercraft or other method of automotive vehicular transport seen in the vicinity of a popular nightclub or bar, intent on ferrying gaggles of intoxicated mid-twenties women; either as fare or as an attempt to gain sexual favours.
"Dude, we're not going to get a cab from here. These are all slagwagons."

Jennifer's friends convinced her there was nothing wrong with getting blind drunk and taking a slagwagon home.
by DarkPansy May 19, 2009
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