jaundice- alarmist term for sallowness
jinx- interjection after accidentally speaking in unison with someone that obligates them to buy you a Dr. Pepper. Some people use it to obligate them to buy them a Coca-Cola. This is a solecism.
job creator- someone who pays others to do work, other than a customer of a service industry.
Judaeo-Christian (adjective)- Jewish and/or Christian, used in religious discussions of Christianity by Christians who think discussing Christianity is inherently offensive to Jews. It is often used to prevent Islamophobic rhetoric from sounding anti-Semitic.
jumpscare- to startle
just (adverb)- forms the diminutive of an imperative- "Just eat less"
just a theory- you are using the word 'theory' to mean a conclusion about the world reached from testing a hypothesis, whereas I use it to mean an unsubstantiated speculation. Therefore when you call evolution a 'theory', i.e. a conclusion about the world reached from testing a hypothesis, you are actually calling it an unsubstantiated speculation.
just saying- phrase used when saying something to indicate that I am saying the thing. If you get offended when people say things like that, now is the time to be offended.