Noisome

This word has nothing to do with noise. It refers to something that is extremely unpleasant, disgusting, gross, noxious, blahhhhhhhhhhh. Like Monday morning, for example.

Avuncular

Friendly and mentoring the way an uncle takes you under your wing, hence the uncular part of the word.

Didactic

Something is didactic if it consciously and demonstrably sets out to teach a lesson. For example, many U.S. sitcoms aimed at younger viewers have theme episodes where they take a moral stance on an issue like drug use eating disorders. Also, I remember (with some fondness, I'm afraid I have to admit), the Highlights for Children comic strip Goofus and Gallant's etiquette lessons like the one below.

Also, check out this funny (very unpolitically correct) parody of Goofus and Gallant.

Visceral

Something that gets your blood boiling, your pulse pacing, that you can feel in your intestestines and deep under the skin is visceral. I like the sound of that.

Deictic

Words that point to something else thus implying a given context have deictic function. Such words can be powerful because they thrust the audience into the middle of a situation establishing specificity.

For example in the classic Budweiser ad: This Bud's for you, this has a deictic function.

Aglet

My daughter has always had a sweet spot for this underdog of a word, which refers to the little plastic thingy at the end of your shoelaces.

BRICS

Not something you build a road with, but an acronym for the five rapidly industrializing economic opportunity centers of Brazil, Russia, India, China and South Africa.

Macrosmatic

My wife is the most microsmatic person I know. I'd like to tell you that that means something romantic, but what it really means is that she has an incredible sense of smell. She once came into our living room and said, it smells like mouse in here, and sure enough, a few days later, we discovered on.

Perfidy

This word sounds kind of cute and friendly when you say it out loud. Pefidy. But don't be fooled, it refers to a disloyal or treacherous act.

Momtrepeneur

A mother who runs a business from home. Google it, and you might be surprised how many sites there are related to the word, like this nice looking South African momtrepeneur portal, for example.

Bailiwick

Most commonly used to indicate the office or area of power of a court bailiff (a court officer). More interestingly, though, it can also be used to describe one's special field of interest or expertise. For example, you could say, "Digital marketing is his bailiwick." Even though people would probably look at you like you were nuts if you did.

Freemium

A common internet-services business model used by, for example, MailChimp and Wix, where you can get a free account to use online services or pay for one with more features.

Exculpatory

Something that works to prove that someone is innocent. Evidence for the defense is exculpatory.

Mydeation

This is a really f***ed up new buzzword. It's really just a new synonym for another made up word, which I like a lot better: crowdsourcing, or using a group to solve a challenge by brainstorming ideas. So, for example, a high school kid who can't be arsed to do his English assignment abuses an Internet QA site like Yahoo Answers or Quora, by innocently asking: What do you think the main themes of Moby Dick are in 1000 words or less. Of course, mydeation can used legitimately for business to generate a product name or campaign idea or whatever. The idea behind it is okay, I just think the word itself is a monstrosity. Let's stick with crowdsourcing, eh?