MCAS 

Marine Corps Air Station.

I'm stationed at MCAS Iwakuni.

MCAS by Lynndeuce November 14, 2005

MCAS 

verb (often all capital letters)

1) Maximum Collision Assurance System
2) Low quality synthetic longitudinal stability system that guarantees you will lawn dart without immediate recognition and subsequent action of pitch trim runaway.

If you don't recognize a pitch trim runaway in any airplane you shall MCAS.

MCAS by ЯЧИθ September 16, 2020

MCAS 

Massachusetts Child Abuse System
(Oh god not really that's a joke)

Teacher: Alright kids, I hope you have some pencils, because we're gonna take MCAS!!!!1! It'll only take about 5 hours.
Students: *groan*

MCAS by EmogusalDamager March 1, 2023

MCAS 

Manoeuvring characteristics augmentation system, or more appropriately, money comes above safety, due to Boeing rushing the 737 max into market while it was unsafe for commercial use all because of money.

M: Money
C: Comes
A: Above
S: Safety

The Boeing 737 max crashed because mcas was incorrectly programmed and was rushed into market. Hence mcas means: money comes above safety.

MCAS by smoking & vaping is for losers January 27, 2025

MCAS

M: Money
C: Comes
A: Above
S: Safety

MCAS means money comes above safety due to Boeing hiding it and poorly coding it to read from a single angle of attack (AoA) sensor to rush the 737 max into market, hence putting money above safety.

MCAS by iPhone=Airbus, Samsung=Boeing January 5, 2026

MCAS Syndrome

The jolt of fear you get when your car's lane-assist feature fights with you for steering wheel control. (Named for the Boeing 737 Max's infamous maneuvering control augmentation system that took away control from the pilot.)

Person #1: "Wow, the steering wheel seems to have a mind of it's own!"
Person #2: "...MCAS Syndrome."

MCAS Syndrome by Schmerdtz May 13, 2024

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