It's a derogatory slang word for a (specifically) white (usually single) women who lives off of welfare/food stamps/wic. With multiple biracial children.
The term comes origins come from the act of buying bread with a wic check.
Three women, preferably MILFs, get together, ploy roles, and have intercourse with strap-on dildos for 3 days. After the 3 days are over they cook a lot of bread so they can pretend to their families that they were just making bread.