Skip to main content
Urban Dictionary Merch
Your favorite words on things you can wear, drink from, read, or give to a friend.
The Urban Dictionary Store sells gifts you’ll have to explain.
The chemical name of sulphuric acid. Drinking can cause 3rd degree burns to the throat and other internal organs.
Johnny was a chemist's son,
But Johnny is not more
What Johnny thought was H2O
Was H2SO4
H2SO4 by pk_peachykeen December 10, 2008
Related Words
sulfuric acid
once there was a willie
willie is no more
for what he thought was h2o
was h2so4
h2so4 by CWBlack May 15, 2014
Sulfuric Acid, used in American auto batteries.
Little Billie used to drink, but he doesn't drink no more, for what he thought was H2O was H2SO4 .
H2SO4 by Brian Conn December 10, 2008
More from Urban Dictionary

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026
Load more