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3.
a.) A form of motorsport where a person can race anything from a completely stock grocery-getter to a full spec racecar can race against the clock around cones for bragging rights on what a good driver they are.

b.) Something you love that takes all of your time, energy, money, and attention. (also see wife or spouse)
"I would have liked to get a full night sleep, afford to eat lunch all week, and do yard work this last week, but I had an autocross on Sunday and I needed new tires."
by Jeff "The Thorn" H August 25, 2008
 
1.
an efficient and highly addictive legal function used for (1) drastically reducing the tread life of a set of tires, (2) mercilessly destroying orange cones and (3) ruining a vehicle's alignment.
I had a blast shredding a set of economy radials in 8 runs at last week's autocross.
by Tom Murphy December 31, 2003
 
2.
also known as Solo II racing-- the SCCA brand name for autocross competition. Solo II events are driving skill contests that emphasize the driver's ability and the car's handling characteristics. This is accomplished by driving a course that is designated by traffic cones on a low hazard location, such as a parking lot or inactive airstrip.
Autocross is the true grassroots motorsport.
by medaeval December 26, 2003