I was wondering if "mogambo" was a mild corruption of something else, so I tried "mugambo".

Now, apparently ntanira na mugambo means "circumcision through words"
http://fgm.org/chelala.html
- which is clearly of no relevance to us at all.

But then there's:
http://www.kalinlures.com/mogambo.htm
Brrrrr!