Re: Elderberries and Hamsters - off topic
Except that hamsters weren't a Middle Ages pet in Blighty. In fact, they weren't recognized by Western Science until the mid 1800s ... and weren't actually bred in Europe until the late 1930s. I suspect that a middle-ages insult based on supposed promiscuity would be more lagomorphic in nature.
As for smelling of elderberrys, other than the obvious[0], this could have two meanings. In the first, the bruised leaves, stems and unripe fruit of the elder have a rather awful smell sometimes described as fetid, thus "your dad stinks!". In the second, the flowers and ripe fruit have a rather sweet smell, suggesting a woman's perfume, thus "your dad is effeminate!".
Note that drinking too much elderberry wine doesn't actually make you smell of elderberrys; it just makes you stink like a drunk. If you don't believe me, it's easy enough to try for yourself ... but try to find a wine that is fermented out, and has little residual sugar. That'll minimize the hangover, which can be horrendous with this kind of plonk. Don't say I didn't warn you. Like most of the poor in the Middle Ages, I suggest sticking to Ale.
[0] The obvious being the Knight is French and is demonstrating his poor ability with idiomatic English, in typical Pythonesque fashion. In other words, the insult was made up by the Pythons for the sketch and had no actual place in history. Hold the Holy Handgrenades, I'm leaving of my own accord.