Source : Free On-Line Dictionary of Computing

software bloat
     
         The result of adding new features to a program
        or system to the point where the benefit of the new features
        is outweighed by the extra resources consumed ({RAM}, disk
        space or performance) and complexity of use.  Software bloat
        is an instance of Parkinson's Law: resource requirements
        expand to consume the resources available.  Causes of software
        bloat include {second-system effect} and {creeping
        featuritis}.  Commonly cited examples include Unix's "{ls}(1)"
        command, the {X Window System}, {BSD}, {Missed'em-five},
        {OS/2} and any {Microsoft} product.
     
        [{Jargon File}]
     
        (1995-10-16)