Top Definition
A combination of misunderstanding and kid.
a. When a child believes an idea/thing is something that is not, and believes this all the way through their childhood until someone corrects them later on in life.
a. I want to pineapple you so bad!
b. That's not what pineapple means!
a. I always thought it was that.
b. Must've been a misunderkidding.
a. I can't believe I had Misunderkid Syndrome.
by EricPlainandSimple December 19, 2011

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