Here are some possibilities:
* Misspelling:
* "Drawl": A slow, lazy way of speaking, often with a prolonged vowel sound.
* "Droll": Humorous in an odd or amusing way.
* Dialect: It's possible "drull" is a word in a specific regional dialect or slang. If you remember the context where you heard it, you might be able to track down its meaning.
* Fictional word: It's also possible that "drull" is a made-up word from a book, movie, or game.
Can you provide more context about where you encountered this word? Knowing the source might help me figure out its meaning.