The definition of a vuvuzela is a long plastic horn that is blown to make a loud, single note.
The horn a fan blows at a soccer match in South Africa is an example of a vuvuzela.
A long, usually plastic horn producing a single raucous tone and sounded by spectators at sporting events, especially in South Africa, as to encourage a team.
Origin of vuvuzela
Of Zulu origin perhaps from Zulu vuvu imitative word expressing the idea of swelling up (perhaps in reference to the puffing out of the cheeks when blowing the vuvuzela) or akin to -vuvu in isivuvu bullroarer, and imitative of the vuvuzela's sound