expertish 

Someone who has some expertise, but not a full blown expert.

My coach is expertish, but he never played ball so he isn’t an expert

expertish by mrmurpal02 July 5, 2018

experts say 

A way to cover up bullshit by making the broad statement, "Experts say", then the bullshit.
As nobody has any idea which experts they were referring to, or what level or expertise they had, it is a great way to cover up not having a distinct source for the information.

Experts say 90% of people in Mexico are drug dealers

experts say by A-Durr October 16, 2013

experts say 

A tired trope that is used in hundreds of headlines a day. The phrase that journalists deploy to be able to say whatever they want, without the need for proper sources. Most of the time, this phrase is used in the headline, or one time in the body text, without said experts ever being identified or mentioned again.

"Experts say that eating your own shit could lower your risk of proper digestive function. Here's why." - CNN

experts say by forsenbased April 16, 2021

experticity 

A word used by non-experts to make themselves sound like an expert. Has more syllables than the word expertise, thus the speaker attempts to sound more intelligent, but usually fails.

Eddie: "Are you finished yet dude? I have important things to do like watch mold grow."
Brandon: "I am trying to share my experticity with you, now that you are a single guy"
Eddie: "I don't get paid enough to have to hear this, go down the hall and share it with Ray."

experticity by dave_the_thinker December 28, 2017

Expertising 

When one is working to become more knowledgeable in an area or increase their ability in a skill.

Person 1: Your have really been expertising your guitar skills with all of that practice.

Person 2: Thanks man, the hard work is really paying off.

Expertising by Stoolie May 22, 2014

Expertese 

The coded, obscure, and impenetrable language used among experts in a particular field, impossible to be understood by people not trained in that field.

"I didn't get a thing out of attending that seminar. The lectures were all in expertese."

Expertese by qpkarl January 3, 2019

expertisio 

To have or hold knowledge beyond all others.

Steve is an expertisio at tear'n up da road.

expertisio by Rio January 15, 2004