Definition and background:
A pair of permanently attached small single- headed drums the larger of which is tuned about fifth below the smaller drum. The bongos are of Afro-Cuban origin and are widely used in the popular music of Latin America. The bongos were widely popular among the beatnik culture of the 1950's in America.
For more information on the music term "Bongos" check out these other resources:
Wikipedia - Glossary of Musical Terminology
Virginia Tech Multimedia Music Dictionary
ORB -- Medieval Music Glossary