1930s; earliest use found in Discovery: a monthly popular journal of knowledge. From Swahili mbuga (m = the nasal component of the initial consonant; g = a velar implosive).
Definition of mbuga in US English:
mbuga
noun(ə)mˈbuːɡə
In East Africa: a seasonal swamp or wetland area.
Origin
1930s; earliest use found in Discovery: a monthly popular journal of knowledge. From Swahili mbuga ( m = the nasal component of the initial consonant; g = a velar implosive).