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Constantly looking at your phone while out with friends and/or at a public event, e.g. concert, sporting event, wedding, etc.
The concert was great, but instead of taking time to enjoy the show he had his smart phone out and he was crassing the entire time.
crassing by shebainpdx August 26, 2013

Metric Chassis 

The General Motors G-Body platform (1978-88 Chevy Monte Carlo, Buick Regal, Pontiac Grand Prix, Oldsmobile Cutlass). "Metric Chassis" is the name given to these cars by dirt track racing enthusiasts because they were the first GM car to start using metric fasteners.
Tom is running a metric chassis but most others have a Camaro at that track.
Metric Chassis by metric car August 13, 2012

Sherief Cassis 

The nicest sweetest guy you could ever have as a friend, boyfriend..or just plain old date. He understands his girl and can relate to her in almost any situation. Hes also very attractive..inside and out. Usually short but sometimes medium high with black or brown hair. He is very unique in his own way. As long as you do not mistreat him, he will remain yours for years to come.
I wish I was dating a Sherief Cassis..id love it soo much.

Girl # 1-omg im so sick and tired of dating these asshole guys

Girls # 2-I think i know what your looking for, a Sherief

Girl # 1- where will i find one???!
Sherief Cassis by girl998998 August 16, 2010

Chassis boys

Just a group of fellas who respect the frame of a car.
Good golly! The Chassis boys started a lynch mob.

That kid is going ape shit. He must certainly be a chassis boy.
Chassis boys by EmpireBart January 22, 2019
Classist
A person who despises or hates a specific class of a person
A hate B because B is middle class

A: Can you get something nicer, also, what car do you have?
B: No, my salary can't afford it, I don't have a car
A: Just get more money then
B: But I can't
A: You see, these people think they're so good because they're 'middle class', well suck to them, 'middle class' is at the middle, I in fact am a 'Upper class' that means you hooligans stealing our money are under us, you have to listen to ME, not your boss, I can buy the company, shut it down, fire everyone if I like, because I control you, your money.
B: Dude chill, don't be classist.
Classist by British Paciic June 11, 2020
To be on your phone during a party, conversation, sports event, or other place where it is inappropriate or antisocial.
"Yeah, we all went out to dinner for my birthday but everyone was just crassing."
Crassing by djnarnz September 7, 2013