Top Definition
A blood-sucking leech usually found in the rectums of adult males ranging from 25 to 60 years of age. Cases have been reported of Yaynivs even feeding off of excess nutrients found in bowl movements that pass by them.
Yaynivs can be killed in a few ways once detected. Loud Reggaeton music can excite the cells of the leech and cause it to explode. Less messy methods include gypsy tears or tacos.
"OH MY GOD HARRY! There's a yayniv in your rectum!"
"Quick, get me the Daddy Yankee CD"
by Dr. ScratchNSniff April 19, 2009

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