1970s. Origin uncertain. Probably either a blend of mob and marathon, with -oton or -aton representing Caribbean pronunciation of -athon, or from mob + -o--o- + ton.
Definition of mob-o-ton in US English:
mob-o-ton
(also mobaton, mob o ton, mob-o'-ton)
nounˈmɒbə(ʊ)tɒn
Barbados, Caribbean
A large amount; a lot.
Origin
1970s. Origin uncertain. Probably either a blend of mob and marathon, with -oton or -aton representing Caribbean pronunciation of -athon, or from mob + -o- -o- + ton.