A “soccer mom” is a mother of a child who plays soccer; the term has been cited in print since at least 1973. Soccer moms became a much-talked-about demographic in the 1996 U.S. presidential election, with both Democratic and Republican candidates trying to appeal to suburban mothers of soccer-playing children.
 
“Sally Soccer-mom” (also “Sally Soccermom” or “Sally Soccer Mom”) is a generic name for such a person. “Sally Soccermom” has been cited in print since at least 2000.
 
Similar names for the average American include Joe Bag of Donuts, Joe Citizen/John Citizen/Jane Citizen, Joe Sixpack/Jane Sixpack, Joe Taxpayer/John Taxpayer/Jane Taxpayer, Joe Voter/John Voter/Jane Voter, John Q. Public/Jane Q. Public and Mr. and Mrs. America.
   
   
Wikipedia: Soccer mom
The phrase soccer mom broadly refers to a North American middle-class suburban woman who spends a significant amount of her time transporting her school-age children to their youth sporting events or other activities. Indices of American magazines and newspapers show relatively little usage of the term until a 1995 Denver city council election. It came into widespread use during the 1996 United States presidential election.
 
(Oxford English Dictionary)
soccer mom n. (also soccer mum) orig. and chiefly U.S. a mother whose child or children play soccer; (in later use, chiefly) spec. a suburban American mother who spends much time transporting her children to athletic events, or otherwise supporting her children’s activities; esp. any such woman viewed as a member of a particular (usually influential) class of voter, consumer, etc.
1973 Argus (Fremont, Calif.) 21 Sept. 4/1 (signature of letter)  Soccer is ideal for them as everyone participates and six is not too young to learn the game. You should see my son play—he is a tiger. Soccer Mom, Fremont.
1982 Morning Union (Springfield, Mass.) 14 Oct. 11/4   The Soccer Moms and the boys and girls raise $5,000 to $8,000 annually through door-to-door sales of candy.
   
Google Groups: alt.fan.cult-dead-cow
myxilplyc
Mar 3 2000, 2:00 am
Yeah, but most people are too computer illiterate to know how to turn their computers on, much less track outbound data.  I’m speaking of course of Sally Soccermom and Billy Ballgame with their AOL account and tons of forwarded stupid email hoaxes, not anyone who frequents this NG.
   
ProbeTalk.com Forums   
MN Probe GT
March 30th, 2001, 03:42 PM
VANS! SALLY SOCCER MOM SUCKS!!!
 
Google Books
Urban Land
Volume 61, Issues 7-12
2002
Pg. 18:
The Harry Home-improvement and the Sally Soccer-mom types have not yet figured out that growth is coming to the suburbs and that it has to go somewhere — and that not dealing with it intelligently can doom communities to continue the pattern of sprawl.
 
Google News Archive
27 February 2003, Southeast Missourian (Cape Girardeau, MO), “River City Journal: Department Of Revenue (Sin Division)” ‎by R. Joe Sullivan, pg. 2A, col. 1:
Joe Sixpack and Sally Soccermom had a couple of options: filing for unemployment compensation or bankruptcy.
   
Gothamist
Kareem Edouard, Filmmaker
By Jen Chung in Arts & Entertainment on January 5, 2006 7:32 AM
(...)
What do you make of hip-hop’s diamond obsession? How is it different from mainstream America’s obsession?
It’s exactly the same. Joe Suburbs spends the same portion of his income on Sally Soccer mom as Diddy does on his “rocks.
 
The Cornell Daily Sun (Ithaca, NY)
Biden and Palin Face Off: North Campus rife with politics
OCTOBER 3, 2008
BY BRENDAN DOYLE
(...)
The overall support of the room appeared to lean towards Biden. Palin’s appeals to “Joe Sixpack” and “Sally Soccer-Mom” were met with jeers and derision, while Biden captured a good amount of the High Rise residents’ respectful attention.