When each member of a group uses their own car to go to the same destination. Typically, describing the case where the group is together at the start or close enough to share rides.
Three systems administrators working in the same office take three cars to lunch in case someone gets an emergency call and has to leave early. "Want me to drive?" "Nah, we better California Car Pool in case the new servers zonk out."
- travelling in a group but each having your own car, rolling in a entourage
Watch the greatest movie ever, Swingers (with Vince Vaughn), for a beautiful example of a good ol' fashioned California Car Pool. The 5 of them roll to parites in a big line of cars. Watch this movie it bomb