Chunk meaning : A part of something that has been separated. A representative portion of a substance, often large and irregular. A sequence of two or more words that occur in language with high frequency but are not idiomatic; a bundle or cluster. A discrete segment of a file, stream, etc. (especially one that represents audiovisual media); a block. A segment of a comedian's performance To break into large pieces or chunks. To break down (language, etc.) into conceptual pieces of manageable size. To throw.