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To act in a very cool manner, or to to be very cool.
He is always so yogster, he doesnt care about anything. OR Brad Pitt is such a Yogster.
Yogster by Wilbur Wilson September 17, 2007
Related Words

Yoster Toaster 

While eating a girl out, the male/female performing the cunnilingus vomits onto the vagina
Dude, can't believe I was drunk enough for the Yoster Toaster.
A hipster of comedy; a comedy snob - one with discerning, GOOD taste in "alternative" comedy, IE Paul F. Tompkins, Todd Barry, Patton Oswalt, David Cross, Bob Odenkirk, Zach Galifianakis, Aziz Ansari, Brian Posehn, Eugene Mirman, Hannibal Buress, Jen Kirkman, Maria Bamford, Donald Glover, Michael Showalter, Marc Maron, Doug Benson, Neil Hamburger, Andy Daly & TOM SCHARPLING/SCHARPLING & WURSTER.

People with no patience for unfunny, pandering, disingenuous bullshit.
MITCH: "Hey dude, did you watch this week's Modern Family, Glee and Sh%t My Dad Says? Also, did you hear the new Jeff Dunham album, see the new Adam Sandler movie, read the new Chelsea Handler book?"

KYLE: "Everything you just mentioned is unfunny and fucking terrible.

MITCH: "Yeah well, you're just a no-good yukster, anyway."
yukster by GuyWhiteyCorngood May 31, 2011
Noun; A pistol that is hidden in the leg of sagging pants. Usually held by people wearing Yankee's caps down to their eyebrows, as to hide their eyes.

Noun; Gun which does yoasting.
Man One: Hey is that guy looking at me funny?
Man Two: Ay bro don't even press him, look at his hat he's probably carrying that yoaster.
Yoaster by IFR_flyer May 10, 2020
That man is an absolute yoster with the ball in his hands.
yoster by JingleBell33345 September 9, 2020

yokester 

A sarcastic and condescending way of calling somebody unfunny.
Also commonly used after someone says "lol" when their joke is clearly not funny at all.
John: I went to the store today.
Corinne: coolbeans!
John: Whatta yokester...
yokester by Matthew G July 30, 2008