If I'm not mistaken, I believe it may also be a particular rhythm of hand drumming.
I have been mistaken before....only once, but I remember it like it was yesterday
From Wikipedia:
Wolof is a language spoken in Senegal, the Gambia, and Mauritania, and it is the native language of the ethnic group of the Wolof people. It belongs to the Atlantic branch of the Niger-Congo language family.
Wolof is the most widely-spoken language in Senegal, spoken not only by members of the Wolof ethnic group (approximately 40% of the population) but also by most other Senegalese. Wolof dialects may vary between countries (Senegal and the Gambia) and the rural and urban areas. "Dakar-Wolof", for instance, is an urban mixture of Wolof, French, Arabic and English spoken in Dakar, the capital of Senegal.
"Wolof" is the standard spelling, and is a term that may also refer to the ethnic group of the Wolofs or to things originating from Wolof culture or tradition. As an aid to pronunciation, some older French publications use the spelling "Ouolof"; for the same reason, some English publications adopt the spelling "Wollof", predominantly referring to Gambian Wolof. Prior to the 20th Century, the forms "Volof", "Olof" and (rarely) "Jolof", "Jollof" and "Dyolof" can be found.