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A prank where you step on the back of somebody's shoe and make it fall off.

Variations:
1. Sandals. It is difficult to flat-tire a sandal, so a different strategy must be used. One way is to kick the sandal out. Occasionally, for fat, loose sandals, the normal method for flat-tiring works.
2. Boots. It is practically impossible to flat-tire an Ugg boot, so what you do is keep stepping on the shoe until it breaks, then they have to get new ones & you can flat-tire those.
3. Backpacks. When you flat-tire someone for quite a while, they become aware of you, but you've got another trick up your sleeve! Pretend to flat-tire that person, they'll dodge their shoe. At that time pull the back of their backpack & everything falls out.
I flat tired this kid and we started playing monkey in the middle with his shoe.
flat tire by vv007!!! May 22, 2008
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spare tire 

The huge roll of fat that often times drapes off of a woman's frame because she is so fucking fat and/or drinks to much beer/eats too much pizza, tacos, enchiladas, pasta, or cake. It can be best seen on college girls wearing tight shirts which they intend on showing off their "hot bod," but actually end up showing some nasty flab going about the entire circumfrence of their mid section, or at this point more like mid country they can be so large .....
"Whenever Kara sits in a bathing suit she covers her stomach because she doesnt want guys to see that she actually has a humongous spare tire."
spare tire by Helayne February 4, 2006
Related Words

Crappy Tire special

The house brand products from Canadian Tire
Also see Crappy Tire
I have a headlight out, but I can’t afford a high quality one, so I’ll just replace it with a crappy tire special one.

redneck spare tire 

a piece of wood cut to the definitions of a tire, and attached to the axle not by the bolts, but with duct tape.
-going down a road-
-massive bump-
-tire flies off a cliff-
guy 1 "$h1t!... great, now i gotta' go make me a redneck spare tire"
-cuts down a tree with a conveniently placed chainsaw in the back of his truck-
-makes a wheel and attaches it with duct tape-
-drives home-

Dirty Canadian Tire

This is when you see a wet dildo in a Canadian Tire store. When you find this it is also known as SCP-69420. A place for gay people to go when they are horny.

Defined also when a Canadian Tire becomes a sex shop for toys and other items.
when a girl tries to give a man a blowjob, but the man stays fully un-erect
She tried to give him a blow job, but got the old flat tire!
flat tire by $heepstain November 7, 2012
the act of pulling your testical to the top of your sack, while holding in between your thumb and index finger the loose skin of your scrotum. Then pump your member and slowly release a testical of your choosing out into the loose skin giving the appearance of a tire being pumped up with air.
MUST HAVE A LOOSEY GOOSEY SCROTUM TO PERFORM THE FLAT TIRE. Otherwise injury and embarassment may occur.
My balls are loose, and it's time to pump my flat tire!
flat tire by taylor j. February 23, 2008