Dat feel good chemical.

A Bloomer is someone with a bright outlook on life who is optimistic in nature. Bloomer's frolic in every opportunity to be happy and try to make the most out of life. The opposite of a Bloomer is a Doomer. The term Bloomer originated specifically as a counter to the Doomer on sites especially like 4Chan.

The root of all addictions.

a chemical that is responsible for "love at first sight"
as explained in charlieissocoolike's video "Chemical Love"
it makes you infatuated with somebody.
it is also the chemical that makes you sort of high and happy.

It's a catecholamine neurotransmitter, which means it sends a message in your brain to tell you that you think that girl you're looking at is fitter to make offspring with than any other dame.

Dopamine is behind a lot of the desire we associate with eating and sexual intercourse. Similarly, all addictive drugs trigger dopamine (the "craving neurochemical") to stimulate the pleasure/reward center. So do gambling, shopping, overeating and other, seemingly unrelated, activities. Go shopping: dopamine. Smoke a cigarette: dopamine. Computer games: dopamine. Heroin: dopamine. Orgasm: dopamine. They all work somewhat differently on the brain, but all raise your dopamine.

the uber chemical in your brain that makes you feel rad.

also where heroin got its nickname, due to it flooding your brain with feelgood.