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1.
A full sized van in which about 5 or more men take turns having sex with a woman. The men that are not having sex are either driving or allowed to masturbate
Dude i fucked Jenn on the slam van that picked me up last night! She was TIGHT
by ME!!?!?! November 24, 2008
 
2.
A lowrider built off of a truck or a station wagon, typically including hydraulic suspension.
Carlos spent months turning an old Volvo into a proper slamvan that won a competition this week.
by TheFreeMan April 01, 2013