One of my methods for learning foreign languages, especially when one is starting out, is to choose a word and use it ad nauseam, almost to the point to where the true meaning is on the verge of being worn out.
I’ve also used this method for languages I wasn’t studying. I remember in high school opening a friend’s textbook and learning a random word just for the fun of it and then using it in odd permutations.
One of the fun things about human language is just about any word can be imbued with sexual innuendo if contextualized and spoken in a certain way.
I’ve shared this philosophy with the kid studying German and am happy he has found the power of this approach.