Weenie Tots refer to a food product eaten by the Bundys, as well as the factory that produces them. The brand itself is owned by Tot Industries, which one of the heirs, Lionel, attempts to marry Kellly in the series finale "How To Marry a Moron".
It is first referenced in the 5th season episode "Weenie Tot Lovers & Other Strangers" as Kelly tries to be the next Miss Weenie Tot Spokesmodel and win a year's supply of Weenie Tots for the family.
When Peggy asks what excatly is a Weenie Tot, Al is surprised and then procedes to tell her:
"What's a Weenie Tot?!...Peg, a Weenie Tot is a delicious little hot dog type meat, wrapped in a breaded shell and deep fried in pure lard...its nature's perfect food"
When Al and Kelly visit the factory for her audtion to be the next spokesmodel, a wheelbarrel marked "Beaks N Claws" is rolled by in front of them, while she asked if he had noticed that there were no trashcans outside. It is also implied that, in addition to the beaks and claws, the meat may also contain the severed hands of some of the factory workers.
On the box of Weenie Tots, it informs the consumers that there is no nutritional value, its not real food and warns:"Do not expose to air. Will accelerate disintegration process". Peg decided not to heed the warning and proceeds to open the boxes to find a winning scratch off ticket, literally turning all the exposed Weenie Tots into dust by the time Al returns home from work.
Outside of the show, this is would most likely be known as "Pigs in a Blanket", a simple hors d'ouvre consisting of a bite-size sausage or hot dog (sometimes topped with a slice of cheese), wrapped in up a croissant, phyllo or biscuit dough and usually baked.