Source : Free On-Line Dictionary of Computing

proglet
     
        /prog'let/ [UK] A short extempore program written to meet an
        immediate, transient need.  Often written in BASIC, rarely
        more than a dozen lines long and containing no subroutines.
        The largest amount of code that can be written off the top of
        one's head, that does not need any editing, and that runs
        correctly the first time (this amount varies significantly
        according to one's skill and the language one is using).
        Compare {toy program}, {noddy}, {one-liner wars}.
     
        [{Jargon File}]