My first definition of chemistry is the study of chemicals (that's how I remember it) and how they react with each other and how to describe the experience and experiments in the most precise and concise words to be interpreted by other people in the scientific community and hopefully the non-scientific community.
My second definition of chemistry is from pop culture, which seems to mean how people relate to each other. A higher chemistry means people get along with each other well. A lower chemistry means people get along poorly or disagree most of the time.
NOTE: This example tries to combine both definitions to get a shared meaning.
Example: The chemicals are having a good chemistry with each other and reacting to beget inorganic or organic products. Sodium hydroxide and hydrochloric acid have excellent chemistry and marry and form their children called sodium chloride and dihydrogen monoxide (commonly known as water by its common name). At the atomic level, the ions are chemically bonding tightly! Yep, it's a real close lovely relationship!
Chemistry is the worst fucken class ever.
A subject taught in highschool. Mainly the period includes various other subjects such as Maths assignments the day before they are due.
Guy 1: Oh fuck I have a maths assessment tomorrow!
Guy 2: Its alright dude, don't fret. We have chemistry next!
A class required in high school designed to make your day shit. The driest assholes from your nearest community college are rounded up and given worksheets to keep for their entire teaching career, of which they make endless copies and in an orgy of sadistic joy they throw them at you and tell you to learn. Chemistry itself if the science of the smallest fucking shit in the universe that just so happens to require the most detailed math problems. If you know what you're doing, you probably don't.
"All right students, keep in mind 2 out of 3 times in chemistry, there is an exception to the rule."
"That make's sense. I'll always remember the hydronium concentration of sulfuric acid. That will help me when I'm the fucking president and making ten times more than my chemistry teacher."
Also known as rape. The University of Arkansas defines it as one or multiple acts of terrorism against many college students, and often leads to the death of children...and GPA's. If confronted with this, know that nothing will save your soul.
College Kid 1: "Man, that Chemistry exam raped me..."
College Kid 2: "Mcdonald's here I come!!!!"
Interactions that originate from personalities.
"He is in dire need of unconditional acceptance and she is exceedingly critical of others. Their chemistry is just awful."
1. A school subject that teaches how the elements of the periodic table react. Chemistry is usually associated with "blowing up" and "setting on fire", but its really squinting into a test tube to watch an underwhelming chemical reaction.
2. The connection between two people, usually in a relationship. The sexual aspect is usually more talked about.
Student 1: Oh boy, I'm gonna take Chemistry next year! That means i'll blow stuff up and watch things fume!
Student 2: No it's not. It's balancing shit and watching things make pathetic bubbles.
Student 3: THERE WERE BUBBLES?!?!?!?
I have good chemistry with my girlfriend in bed.