soccer moms started out as a US thing.
soccer was/is the fastest growing womens sport in the US, as well as now having the highest average tax bracket of amatuer players. basicly guys were playing soccer instead of tennis and squash, and girls as well. it was becoming a very yuppie/prepie thing to play. if you wanted to be part of the next "tennis" social scene, soccer was for you. it was noticed that a very large number of the yuppie moms driving their kids and theirselves to practice were driving SUV's. it became a bigger status symboll to have a merc 4WD than a BMW sports car. and so the soccer mom was born. rich, yuppie, useless, consumer whores, who's only real concern was how it looked, not what it did.
and the car industry responded by making womens specific models of some of their large 4WD wagons. if anyone has seen the episode of the simpsons where marge ends up with the canyonaro 4WD, that was supposedly written in responce to one of the writers getting run off the road by a chevy suburban driven by mom and some kids going to practice. the suburbans come with retractable steps so you can get in, special dash pockets for "make up and accessories" and " an attractive range of colors designed for todays woman".
that doesn't mean you don't see them at hockey, but as the t-shirt says "my hockey mom could beat up your soccer mom"
*edit* as a biker, i hate those things even more than volvo's. the most dangerous thing on the road today is some mom outside the school looking at the kids in the back and yelling at them to sit down and shut up, all while driving in 2 lanes at 60kph. i'd rather wrestle crack crazed aligators