"La-di-da" - An interjection indicating that something is pretentious. ex: "Your daddy bought you a car, well la-di-da, aren't you special." (it is mean and you say it dryly) "Lickety-split" - As fast as possible. ex: "You'd better get your work done lickety-split!" Those are some strange ones in English.

Transustanziazione. It's a religious word with a meaning kinda hard to explain haha

One strange English word is "crwth." It is said that in English the vowels are "A, E, I, O, U, and sometimes Y," yet you will find the word "crwth" in most big dictionaries, as well as "cwm." I like the word "tintinabulation." It is the sound made by a bell, and is used in Edgar Allan Poe's poem "The Bells." A "sesquipedalian word" is a very long word. It literally means the the word is 1-1/2 feet (50 cm) long.

The Afrikaans word "krimpvarkie" always amused me when I was young. It means 'hedgehg' but you if translate it directly it's 'shrink pig'.

In El Salvador we call "pajero" to person who is lying.