look up any word, like sparkle pony:
 
1.
An upset stomach caused by eating too many sweets.
"I had some icecream, but I ate so that much it gave me a yummy ache..."
by Spaz The Fallen June 12, 2008
 
2.
A happy, persistent feeling in the stomach after a pleasant meal or snack
My boyfriend and I went out for ice cream...afterwards, I had such a yummyache!
by Anita1966 February 03, 2010
 
3.
a stomachache you get after you consume too much food prepared by the amazing East Village Chinese restaurant, Yummy House.
"Sally got a yummy ache after she downed her tofu with mixed vegetables too quickly."
by natiqua March 01, 2009