If you read old Billboard magazines from the 1940s-1960s, then you'll sometimes run across the phrase terp tempo in its record reviews.
In fact, if you Google the phrase terp tempo, almost all of the results will be from old Billboard magazines. Those old Billboard record reviews practically had their own vocabulary, and terp tempo was a bit of jargon that Billboard's anonymous reviewers liked to throw around.
But what does terp tempo mean?
Terp is short for terpsichore, which refers to dancing and choreography. In short, a "good terp tempo" is a good tempo for dancing.
In Greek mythology, Terpsichore was one of the nine muses. As the goddess of dance and chorus, she was often depicted—as in the illustration above—with a lyre. In Greek, the literal meaning of the word terpsichore is "enjoyment of dance."
Over time, Terpsichore's name came to be synonymous with dance. The earliest example of this usage, according to the Oxford English Dictionary, was in 1825. Charles Dickens, in 1865, used the phrase "Terpsichorean art." In 1869, the derivative terpsichoreal appeared. The word is rarely used today, although Wesleyan University in Connecticut has a dance program called Terpsichore.
The only instance of terp tempo that I've run across outside of Billboard was a reference to a 1954 article in Variety about Perez Prado. The subtitle of the article was "Puerto Rican Terp Tempo Is Spreading." Variety was probably copying Billboard's lingo.
Here's a smattering of Billboard album and single reviews from 1946-1961 in which the phrase terp tempo is used. I could have doubled this sample if I had also included the phrases terp beat and terp rhythm. Billboard continued to use the phrase terp rhythm until 1964.