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2.
A sour citrus fruit that a man named Cave Johnson invented to make explosive. It is capable of burning a house down.
When life gives you lemons, don't make lemonade, make life take the lemons back! GET MAD! I DON'T WANT YOUR DAMN LEMONS, WHAT THE HELL AM I SUPPOSED TO DO WITH THESE?! Demand to see lifes' manager!! Make life rue the day it thought i could give Cave Johnson lemons!! DO YOU KNOW WHO I AM!? I'M THE MAN WHO'S GONNA BURN YOUR HOUSE DOWN! WITH THE LEMONS! I’m gonna get my engineers to invent a Combustible lemon that burns your house down!
by PopNotes July 26, 2011
 
1.
A lemon that can burn your house down.
All right, I've been thinking. When life gives you lemons, don't make lemonade. Make life take the lemons back. GET MAD! I DON'T WANT YOUR DAMN LEMONS! WHAT AM I SUPPOSED TO DO WITH THESE?! DEMAND TO SEE LIFE'S MANAGER! Make life RUE the day it thought it could give CAVE JOHNSON LEMONS! DO YOU KNOW WHO I AM?! I'M THE MAN WHO'S GONNA BURN YOUR HOUSE DOWN! WITH THE LEMONS! I'm gonna get my engineers to invent a combustible lemon that's gonna BURN YOUR HOUSE DOWN!
by TimeDeatH April 29, 2011
 
3.
A kind of lemon that is most commonly used to burn houses down.
"I'm gonna get my engineers to invent a combustible lemon that'll burn your house down!"- Cave Johnson
by FrodoFraggins September 26, 2011