A drug that can be really great, or really horrifying. Even experienced users can have a mind-frying bad trip that requires some time in a mental institution, and there is no rhyme or reason as to why this happens. Acid-heads like to brag about how many times they've taken the drug, but most of the time they are lying.
DooOO000d, me an a friend dropped acid last night and we got stopped by the pigs and got questioned for 10,000 years.
by The Dodger August 13, 2004
Get the acid mug.
A style of techno/house music, noted for its prominent use of the of the Roland TB-303, a synthesizer with a distinctive (and very funky) sound. Variants include hard acid, acid house, acid trance, etc. Not all music that includes a 303 is necessarily acid, and not all acid music makes use of the 303 (but most of it does).

Some suggest that the word is derived from the phrase "acid burn" - a slang term from the early days of house music, referring to the practice of sampling from another musician's records (see bite).

Others cite a 1985 house single by Phuture called "Acid Trax", which is recognized as one of the first house records to make use of the 303.

A more concrete theory is that it refers to the drug LSD, which is commonly used at raves where acid house is played. Given the psychedelic nature of acid house, this interpretation is certainly part of the popular understanding of the term, if not necessarily its historic origins.
Drum & bass is okay, but what I really want to hear is some nice tweaky acid.
by Greenie December 10, 2003
Get the acid mug.
LSD was first synthesized in 1938 by Swiss chemist Dr. Albert Hofmann at the Sandoz Laboratories in Basel, Switzerland, as part of a large research program searching for medically useful ergot alkaloid derivatives. Its psychedelic properties were unknown until 5 years later, when Hofmann, acting on what he has called a "peculiar presentiment," returned to work on the chemical. He attributed the discovery of the compound's psychoactive effects to the accidental absorption of a tiny amount through his skin on April 16, which led to him testing a larger amount on himself for psychoactivity.

sadly the acid that is taken today compaired to 20 years ago is a basterdised version with more effects to physical sensation and a reduction in auditory and visual stimulation. it is said to be a hallucinogen but in it has been proven scientificaly that it actualy causes a temporay break down in a mental berior wich causes you to notice signals that you would normaly not notice it also sticks a door stop in the door to your subconcious wich allows your emagination to run wild there by the hullucination is based on an actual event taking place.
guy1 "dude i took a bad hit of acid last night and i had no clue what was going on."

guy2 "you meen you took real acid last night not that stupid wuss bag shit u normaly took and had the best trip of your life u fuckin tard."
by luke neville November 17, 2006
Get the acid mug.
John: Acid is a hell of a drug.
Jack: ye.
by mfbails January 30, 2010
Get the acid mug.
1. adj. A way of being which is negative and/or hurtful.
Jenny: Your shoes suck, Jimmy!
Jimmy: Yo Jenny, why you gotta be so acid?
by JohnnyHotcakes99 May 27, 2016
Get the Acid mug.
Unforeseen accident that happens to somebody while tripping on Acid!
"Man, I acidentially tried to pull a badge from a cop to see details on it better!"

"I thought I hooked up with a girl, but she was a graffiti. What an acident!"
by acident December 9, 2014
Get the acident mug.