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1.
When a person regrets how they have lived his or her life, and they attempt to 'correct' their mental issue in a variety of ways which usually always harms themselves or those closest to them.
Bob: "Hey Tim, how's it going brah?! I just had a revelation. I realize I hate my life up to now and feel like I jumped into this marriage. I'm planning to divorce my wife and am gonna sell this stupid station wagon. Pretty badass huh?"

Tim: "Umm, Bob? You're 47 years old. You've been married for 24 years, have 3 kids and another on the way. And what does brah mean? I think you're having a midlife crisis, you might want to rethink this. I mean you have a plastic hip and a pacemaker!"

Bob: "Nah you're crazy brah, I already asked that hot intern out and put a down payment on a Corvette. Life is gonna be great. And let's keep that pacemaker thing on the downlow."

Tim: "But you'll have to pay child support, alimony, and still have your 'great life' to pay for."

Bob: "Timmy my friend, that's what credit cards are for."

Tim: "Whatever. Enjoy bankruptcy."
by Zastro November 28, 2009
 
2.
when a person (more commonly a man than a woman, but either can experience this fate) begins to question their purpose and direction in life and oftentimes begins to regress back to their teenage years in the way they think and act. they usually are laughed at by their peers because they make themselves look silly by acting much younger than they actually are.
"He's 50 and just bought a red Corvette. Is he having a mid life crisis?"
by Someone Who's Seen It August 10, 2008
 
3.
The point in an adults life where they get all concerned that they're old and start acting what they think is 'young'.
He was calling the kids on the street dude and saying like a lot. It was scary.
by Dudette March 23, 2005
 
4.
"When an old man buys twenty lamborghinis." -Diggy Simmons
"A man with a midlife crisis buys a corvette, a man with a lamborghini has no crisis." -Joseph "Rev Run" Simmons
by logitechamerica May 31, 2007
 
5.
Mid-life crisis (MLC, not to be confused with TLC) is a very common among people ranging from 30-50 years of age. In every aspects of our lives, mid-life crisis finds its voice through every passage of our lives. People with mid-life crisis falsely believed that they are young (from ages 15-25). They drive a Corvette, Mustang, and other sports vehicles. On a daily basis, people with mid-life crisis can be discovered/hunt down on regular college campuses. People with mid-life crisis can be best described by using the term-"middy-life." Middy-lifes have an untrammeled desire to achieve a feeling of youthfulness and horniness. The effects of mid-life crisis can lead an individual to evolve into a pedo bear.
If you are 30 years old or older, then you are a mid-life crisis.
by benchmax345 May 10, 2008
 
6.
A time in every true bros life. It is a last ditch effort to remember their roots and return to the true acts of brotholicism.
guy 1: My dad's going through his midlife crisis
guy 2: How do you know?
guy 1: Well, he jumped out of a plane at 15,000 feet, been hitting bars every night, bought a motorcycle, bought a drumset and guitar which he cant play, and I'm pretty sure he's having sex with my girlfriend.
guy 2: He is indeed a true bro
by DERPdaDERPdaDERPdaDERP.......2 April 07, 2011
 
7.
The reason why my dad has a Mustang in his driveway.
Fred: What's with your dad's car?
Joe: Midlife crisis.
by maxaddicted August 30, 2010