“Half a pound o’ tupenny rice,
Half a pound o’ treacle.
That’s the way the money all goes,
Pop goes the weasel.”
Pop means pawn, as in trading in something for money at a pawnshop. I don’t get to use this next phrase very often, so I’m going to interject it now- Testicles of the Medici (q.v.) Weasel is a tool used by tailors, IMS. Ergo, get some cash and buy a little food. The whole thing seems to be a bit of the O. Henry “Gift of the Magi” concept, but if you’re looking for logic, skip over some nursery rhymes.