Its so sad that many of my favorite wordgags are so easily destroyed by translation this ):
"Scrunchies" are also nicknamed as "gummys" in germany, but Condoms are also nicknamed as gummys.
Also, by "on his tail" the girls refer to his braid, like in pigtail or something. But when someone says "tail" in germany, also a guys dick can be meant. Putting all together, i hope you get the idea
Dominik's archenemy "von Behind" is actually a little gag going towards our behated maths teacher, who is called Ms. Hinte, and "Hinte" is close to the german word for "behind". Now, since the "von" is a very common byname and most people dont know what it means in german, it means from. putting all together, he is saying his archenemy is called "from behind" ):

And if anyone doesnt know Meister Proper, go here: [link]
Its a very well known washinggel label

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