know one's onions 

to be competent and authoritative in one's work

He really knows his onions when it comes distilling alcohol.(example of know one's onions)

know one's onions by The Return of Light Joker October 18, 2010

Know-it-all

one given to teaching others all the time on all sorts of topics when their information is based on unproven opinions presented as absolute truth; a pedagogue

"Ok, whenever you go to a party you have to wear really, really happening stuff or else no one is going to hang around you. Straw hats are what's happening. If you wear straw hats people are going to take you seriously. You also can't go wrong with sandles. Now, if you wear things like this or this you'll get beat down so it's best to just throw them out. Ok, stores! You can't go to just any place to shop. If you want to buy what you're looking for, there's only one place to go. That's over at O'Mars. Now, never, I repeat, NEVER go on the North Shore Bus. The people are going to get on your nervs on the North Shore bus and the seats are going to give you back pains. Taxis are the best way to get around in this city. If you have your hair hanging all out, all the girls are going to to be looking down their nose at you. When you want a girl to know what's going down, you have your hair in a ponytail. When you go out to eat, you want your butt to look big. You can find stuff to stick in your butt over at Omar's. It's the first thing you want to buy. Now, lesson one about boys-" "I don't have time for all this, know-it-all. I doubt all that stuff is even the case."

Some know-it-all acting like a teacher on everything instead of just shutting his mouth for two seconds.

My other attempt to describe the word know-it-all on this page was actually a description of the word "patronize" or "condescending" which is to treat someone as if they're less intelligent than you or less smarter than you are, whereas a know-it-all is a person who acts like an expert through dogmatic teaching.

Know-it-all by know-it-all Isaac August 2, 2008

know de wey

Uganda's way of telling you their religion of satanism.

Ugandan: Do you know de wey.

Non-Satanist: No?
Ugandan: I will teach de wey of de devil.

know de wey by Fagiqueer Putin May 2, 2018

know your meme

Know Your Meme is a website that is best known for the research and archiving of internet memes. On the side, Know Your Meme has a image gallery that users can upload examples of memes and softcore porn into.

Some guy: I went to Know Your Meme yesterday.
Some other guy: Oh, did you look at memes or something?
Some guy: No, just fapped to softcore porn.

know your meme by JConlisk June 16, 2017

Know the nip 

A game played at bachelorette parties. It is comprised of the maid of honor taking a photo of each attending guest beforehand. The photos are of each girl topless. The game part is for the bride to be. A slideshow is created of 1. Close up and guest a's nipple 2. Shot just of guest a's brests 3. Full shot of guest a. And so on for each guest. The bride has two chances for a correct answer for each guest. Each wrong answer she takes a shot or punishent. If she guess right, the women with the photo up takes a shot or punishment.

This game is only played between close friends.

Are you coming to the bacheloerette party? I heard we are playing know the nip.

Know the nip by party girl expert November 14, 2009

Know Man 

A person who claims to know everything about everything, until someone else calls their bluff and makes that person look like a fool. Basically, a know-it-all with ridiculous assumptions and little-to-no proof.

Guy 1: Did you know that this new game console was coming out, during the Summer time?

Guy 2: Stop right there, you stupid know man! I just found out from the creators, they said they plan to release said console sometime during the Fall.

Know Man by ThatGuy2969 November 23, 2013

Know Your Meme

The site that gives out detailed information on memes

Know Your Meme has a lot of information about memes!

Know Your Meme by Nutty Nuts December 9, 2016