Top Definition
A telepathic freak, who smears peanut butter on peoples faces, and doesn't give them frosting.

Verb: to cause an erection with a lollipop
She's such an Yssi

I caused nathan to yssi!
#nathan #telepathic #peanut butter #lollipop #frosting #erection
by HanperBah November 17, 2010
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