1 definition by Yolanda Berenstan

Top Definition
The roller coaster enthusiast's roller coaster rating scale, derived from the expression "Yaaa! My hat!" refering to the lost of a hat while riding. The number of Yamahas indicates the speed and quality of a ride, the greater the number, the better the ride. The antonym is Nomaha].
That child's roller coaster wasn't even worth one yamaha.
by Yolanda Berenstan March 14, 2009
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