From breeder + -mobile.
breedermobile (plural breedermobiles)
- (slang, derogatory) A vehicle (particularly a minivan) used by parents to transport their child/children.
1998 March 26, GHarris938 [username], “Re: Buses”, in alt.support.childfree[1] (Usenet):What is there, a line of breedermobiles (minivans) waiting at the bus stop?
1998 September 9, Beth George, “Re: Very weird theory”, in alt.support.childfree[2] (Usenet):Someone wrote about being stuck behind a breedermobile with the license plate "5OFUS" I was about to post "I read that as '50 of us.' Shudder"
2007 May 17, REP, “Fun With Breeders, or Dude, Where's Our Car”, in alt.support.childfree[3] (Usenet):Last night I went to the local Target to resupply cat litter. I noticed a breedermobile, loaded with a litter, pulling into a handicapped space... without a handicap permit or handicap plates.