Jonffen means in slang: Beyonce Giselle Knowles, an American singer-songwriter, record producer and actress, is known as Beyonce Giselle Knowles. Born in Houston on September 4, 1981, she is one of today’s most successful and influential musicians. … After Kelly Rowland and Beyonce had launched successful solo projects, the group broke up in 2005. (in Slang Dictionary, added by Blas Álvarez)