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Abbreviation for Might Crash Anytime Soon. A faulty software system responsible for the crashing of multiple Boeing 737-MAX aircraft.
MCAS is the software that caused those 737-MAX airplanes to crash. Sucks that a computer glitch is responsible for such tragedies.
MCAS by FegelFatso April 10, 2019
Related Words
a standardized test in Mass that you need to pass to graduate, may be recognized with the feeling of being so bored you want to stick your #2 pencils in your nostrils and pretend to be a walrus
A: NO DON'T JUMP YPU HAVE SOOO MUCH TO LIVE FOR!
B:....I have the mcas tomorrow
A: Hmmmm... i see your piont
mcas by unknown April 6, 2005
Stands for: Massachusetts Comprehensive Assessment System
A standardized test that must be passed to graduate high school in Massachusetts. While the high school curriculum is tailored to the material on the exam, most questions can be answered with a basic understanding of the English language and a minimal amount of common sense. Many people (parents) protest its existence because they think their kid won't pass, but all students know that it's a great waste of a week of school. While you do get almost four hours to do it in, most people finish in the first twenty and spend the remaining time reading, sleeping, or drawing dirty pictures on their desk with a whole box of #2 pencils.
The MCAS weeds out people that aren't fit to be a part of society.
MCAS by apqoeur January 19, 2008

McAssWhoopin 

A punishment received by someone who act foolish within McDonald's
Boy pull up to the drive-thru window and get this McAssWhoopin
McAssWhoopin by McFinneseUrHo June 28, 2017
McAss is what happens to you when you've been stuck in a McJob for far too long. All the cheap, unhealthy and shitty food that most McJob employees consume eventually goes stright to their asses making their asses resemble two dogs in a gunny sack fighting over an Easter ham.
X: Look at that cute girl making my milkshake
Y: She's cute but look at that McAss, she's got a lot of junk in that trunk
McAss by GibtowN December 7, 2003

McAsshole 

an asshole who makes frequent trips to McDonald's
"no nigga i don't want a Double Cheesburger, I want a Big Mac"

"Man, you actin' like a real McAsshole"
McAsshole by Niggeratchi May 20, 2010