The Spare 

The middle or youngest male of every family, Always overlooked by the family due to their attention being put to the "Air to the family name"

James Bradley is the spare of the family, Johnny's the air

The Spare by Ya.Boi November 4, 2017

The Spare Tire 

Similar to the Third Wheel, the spare tire is that fifth person you bring on a double date who has to sit by themselves.

This can be especially embarrasing if the spare tire has to pull up a chair to a booth for four.

Spare tires are usually your socially awkward homies or people you feel bad for.

I'm never hanging out with Billy again. He said we were just going to the movies with 'some friends' but I actually just got played into being the spare tire!

The Spare Tire by TheJbros11 January 15, 2011

Pick up the Spare 

When you ejaculate into someone's mouth and hit the uvula

Wes' uvula is so huge, when I shoot my load down his throat, I always pick up the spare.

Pick up the Spare by Bri-and... April 8, 2016

Kill the spare 

A phrase uttered by Lord Voldemort as an instruction for wormtail to kill Cedric Diggory

A phrase now used to advocate the removal of a fat, unatractive or generally undesireable girl from a group of otherwise good talent

Black Dog: Hey man these chicks we hooked up with are smoking, except that fuggers bitch
Titan: Yeah man, Kill the Spare!

Kill the spare by The Fresh January 12, 2008

PICK UP THE SPARE ON A 7-10 SPLIT 

ramming a bowling trophy in a persons anus

I ASKED MY WIFE IF I COULD GIVE HER A 7-10 SPLIT. SHE SAID ONLY IF SHE COULD PICK UP THE SPARE ON A 7-10 SPLIT ON ME.

PICK UP THE SPARE ON A 7-10 SPLIT by jjackson74 September 27, 2012

Kill the spare! 

:)

What you say when you don't want someone around. Namely the Cedric Diggory(ies, s?) of the world. Found in Harry Potter and the goblet of fire.
and more importantly, in the internet cult favorite musical, A Very Potter musical.

Harry/Darren: 'Cedric, seriosuly, screw off. You're just this spare guy who noone wants around. You're such a spare! "
Quirrel/Voldemort/Brian/Joe : KILL THE SPARE! AVADA KEDAVERA!

Kill the spare! by InomRedVines August 28, 2010

on the spare of the moment 

To do something on the spare of the moment means to do it without a lot of planning.

I like to drive somewhere on the spare of the moment.

on the spare of the moment by dmytro December 14, 2008