The line comes from the Polish voice set used for Worms, the turn-based strategy games known for cartoon worms battling with absurd weapons and one-liners. In Polish, bulka z maslem simply means a bread roll with butter, which is part of why the clip travels well beyond Polish-speaking audiences: the phrase is short, rhythmic and easy to repeat. Shared on soundboards and reused in short edits, it survives as a small food joke rather than a story reference, because its charm is in the plain, cheerful delivery.