Top Definition
When something extreme happens. It can be good or bad, it just cannot be a mild occurance. You can also input the word no or yes in front of YAHHSIMINIOFF to show others if you are upset or happy. The meaning and usage is similar to WOMBO
while walking through the park my friend bought me some icecream. it was like a parade in my mouth!!! so i exclaimed YAHHSIMINIOFF!!! he asked if I liked it and i said YESSSiminioff!!! a heathen squill threw nuts at me and my iced cram fell on the ground! In disarray i yelped NOOOOOsiminioff!!!!!!

For further detail look us WOMBO
by imani tsunami February 06, 2008

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