It’s nice to learn some fun words occasionally, and I rather enjoy teaching students the expression “ni fu ni fa”. You probably won’t find it in a dictionary, but it means something like “neither here nor there”. When I teach it, I tell students that it’ll make Spanish people smile, just because they don’t expect to hear it from a foreigner.
I have a student who speaks only basic Spanish but is a tremendous extrovert and likes trying out everything he learns. I saw him the other day for the first time in a few months and he made a point of thanking me for teaching him “ni fu ni fa”. He said that every time he uses it people roll around laughing. Apparently the other day a waiter asked him if he’d enjoyed his meal. He smiled and said “Ni fu ni fa”, at which the waiter nearly dropped his plates on the floor. So perhaps I should add … use it with caution!