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1. Difluorine dioxide
2. The sound FOOF makes when it reacts with pretty much anything.
The FOOF went "FOOF!" when I spilled it on the floor. Now I have to explain the crater to my landlord.
foof by R-dog December 14, 2013
Related Words
foof foofy foofie Foofle Foofer foofah foofing foofin' foofus Foofur
The most elite and prestigious title you shall bestow upon any rank of human. The rank of FooF will not be given it shall only be earned. Most people shall not obtain the rank of FooF within their lifetime, only the best of the best will ever earn themselves the rank of {FooF}
“ Damn that guy is cool”
“Yeah obviously, he is in the {FooF} clan."

"Can I join the Foof clan?"
"No, you are not FooF material Humphrey."
FooF by TheCoachRichie December 8, 2018
The street name for administering drugs via the vagina. An effective but unconventional way for someone with a vagina to take drugs.
My friends sister likes to foof her drugs instead of snorting them. ,

My girlfriend had a cold so she tried Foofing her drugs and it worked well she said.

I fell asleep and when I woke up my now ex girlfriend said she had foofed all my drugs.
Foof by Boofing it July 3, 2020
The word everybody older than me used instead of "vagina" until I was about sixteen. I still use it now, probably due to force of habit. Even when I'm talking dirty to my missus.
Me: "Does that make your foof feel good?"
Missus: "My what?"
Me: "Too late, anyway."
foof by The Scandal April 6, 2005
A form of flatulence, often found in small unhearable noises coming from your butthole. Similar to the "silent but, deadly" category of passing gas.
Foof by Dr. Gluteus Maximus February 20, 2009
An expression after the realization of an amazing occurrence.
after a wicked hot girl walks by
Dan: Hey Paul, did you see that hot girl?
Paul: Foof..!
Foof by Alpacino January 20, 2009