A relationship that blends aspects of a casual relationship (no strings, random physical interactions) and a serious relationship (dedicated partner, formal exchanges like "I love you," etc). A caserous relationship often begins when two people want a serious relationship, but aren't ready to mentally acknowledge it.
"Linda and I are in a rather caserous relationship"
by endlessmonkeys November 02, 2009
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A girl who requires more than a case of beer to sleep with
That fat chick was a caser
by Wolf with red October 14, 2019
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An alternate pronunciation of Cesar, but cooler sounding. Latin Pronunciation that just makes him sound badass. It is only reserved for the coolest of all Cesars
Dude: Caser is the most fucking awesome person.
by IamMyselfandnoneelse August 31, 2010
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A prepared option that is available "just in case" the main option fails.

Other terms that describe a just-in-caser:
- Plan B
- Contingency Plan
- Alternative Measure
- Emergency Option
Jarvis: Why on earth would you buy airplane tickets when we've got cheap train tickets booked and ready to go see the Super Bowl?
Daniel: Relax dude! Airplane tickets are just-in-casers. Remember what happened last year? I don't want train delays causing us to miss half the Super Bowl game ever again.

Nora: You brought both your laptop and the iPad to the business meeting!?! You're not gonna need both!
Bethany: I only brought the iPad as a just-in-caser. I'll be taking notes on the laptop.
by OffBeatDrummer January 05, 2021
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