metafive noun \meh-tah-fyve\
a metaphor (as in black sheep of the family) so overstated (as in worse than Hitler!) as to render the speaker's argument dismissible as hyperbolic ranting.
betaphor noun \beh-tah-foare\
1: version of a metaphor that is almost finished (as in dingy sheep of the family) and is being used for testing
2: a riff on or secondary/expanded use of a well-known metaphor (as in Glenn Beck of the family)