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Getting an elbow in the testicles during a pit stop gone wrong.
I was getting the best pit stop from this girl when she accidentally gave me a flat tire.
Noun

Slang for 'half flaccid penis' or 'incredibly small and useless penis'. This is said to originated with the Tourette's Guy.
You Have a flat tire.
flat tire by misterissues June 11, 2009
When you have a good buzz, then you eat food and the food kills your buzz completely.
"There I was a Billy's house for a BBQ. I had like 3 Oly tall boys and was feeling great...until I ate a fat burger...completely lost my buzz...totally flat tired my self"
Flat Tire by Johnny Boy Kz August 11, 2014
In a chick fight when one girl steps on the other girls foot and punches her in the chest really hard.
Flat Tire by ASS-assin August 29, 2009
when you punch a person in their breast implants so hard that they burst, thus giving their chest the appearance of a flat tire.
I accidentally elbowed her in the left tit and now she has got a flat tire
Flat Tire by jermlova March 18, 2011