In theatrical improv, a song in which players sequentially sing each line.

Good improvisers will set up the next player by providing an obvious rhyme, so that the song works.
Shameless improvisers will get a big laugh at the expense of their partner by ending their line with a word like "orange" or "flavivirus."
Bad improvisers (nervous or arrogant) don't listen to what comes before them, and not only miss the rhyme, but the meter and line length as well.