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1.
(Used in the plural) Unspecified but perceptible faults or deficiencies; used by preadolescent children to tease or impugn their peers

Perhaps from an early dice game of the same name "KOOTIE", whose object was assembling a repulsive looking insect of plastic parts; consciousness of this term and notion is ubiquitous among those raised in the United States
1. I don't want to play with Johhny---he has kooties!
2. That was when I still thought girls had kooties.
by dakangan January 28, 2006
 
2.
Unspecified but perceptible faults or deficiencies ranging from undesirable personality characteristics and poor hygiene habits to bacterial germs; used by preadolescent children to tease or impugn their peers, and occasionally by adults, usually with humorous overtones.
Used in the plural

Perhaps from an early dice game of the same name "KOOTIE", whose object was assembling a repulsive looking insect of plastic parts; consciousness of this term and notion is ubiquitous among those raised in the United States
1. I don't want to play with Johhny---he has kooties!
2. That was when I still thought girls had kooties.
by dakangan January 28, 2006
 
3.
Something all girls have. Scares little boys away while young. Attracts them once they get a little older.
Example 1: (Little Boy) Run, she has Kooties!

Example 2: Dude 1 "Hey bruh let's hit up that party an go kootie huntin." Dude 2 "Yee let's go catch some kooties!"
by The Luvver February 20, 2012