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Shorthand way of writing "Phenethylamine", an alkaloid and monoamine. Phenethylamines are a family of compounds that include neurotransmitters, hormones, stimulants, 'hallucinogens' and psychedelics, entactogens and empathogens, anorectics, bronchodilators, and antidepressants.
In the chemical index section of Alexander Shulgin's book Pihkal, the word phenethylamine is replaced by the abbreviation "PEA".

Examples of PEA's: Dopamine, (Nor)epinephrine or adrenaline, various amphetamines, MDA/MDMA, Mescaline, DOx's, 2C's, and so on.
PEA by (Om) April 4, 2008
Related Words
A person that is loveable and they are cute and you just want to give them a big hug!!!
Awww Katie I love you, you are such a pea!!!!
pea by Maddie August 8, 2004
A small orb like vegetable which belongs to the family of vegetables called Green Things, the latin name for which is Peamus.
Peas can be shot out of tubes from your mouth or buttocks via a tube at unsuspecting passers-bye. This practice was first used by the Irish sailors who's boats could not carry loads heavier than a sack of potatoes. Instead of firing cannonballs and enemy ships, they peppered them with peas. However, as they were not frozen, they merely dissintegrated upon impact.

Another use for peas are for motorists. They can be placed inbetween the grooves in tyres to make makeshift slick tyres. This use for peas was again invented by the Irish who are usually too poor to buy slick tyres.
Man 1:Look at that chaps tyres, they are green!
Man 2:Yes my fellow homosapien, the man infront does indeed have green tyres, he has makeshift slick tyres.
Man 1:Oh I wish I was as cool as him.
Man 2:One day you shall be, one day.
Pea by Ruairi Mccarthy December 7, 2003
the amount of weed/mrijuana/cron/dope you pack in the peatube of your bong to smoke
Pea by phatsho December 16, 2008
Synonym for the brain, mind, head, skull, or the general area within the head.
Ahhhh, man! I have some serous Pea pain!
Pea by The real Darkhawk1 March 4, 2010
Having to pee from drinking to much tea.
Her: Brb, I drank tea so I'm peeing a lot!
Him: You mean...you have to...pea?
Pea by ericafreakindani September 5, 2011