Stands for "I should've been invited". An acronym used to describe excessive erratic behavioral shifts when the offending party is not privy to being invited somewhere due to her ever-sad countenance, overall gloom and perpetual air of malaise.
Scott: "Paul's at the mall, I just had to come back and get something."
Scalene <super off the wall excessively offended with a red face and teary eyes>: "At the mall? I should've been invited."
Scott: "I don't have time for this now." <muttering in orcish; "fcuking ISBI">
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a cute intelligent girl with a ditsy personality. Tries to get away with everything with an innocent smile or giggle. At times she can be passive but stands up and holds her ground when it comes to issues she truly cares about. definitely a lady in the streets but a freak in the bed.
Isby is the kind of girl you want to marry.
ISBI - short for 'I Swear By It' - is more than a recommendation; it's a passionate endorsement of something that's not just good, but life-changing. This phrase combines youthful enthusiasm with deep conviction, perfect for sharing anything from groundbreaking gadgets to inspiring ideas. It's your way of saying, 'This isn't just great, it's a game-changer, and I wholeheartedly stand by it!'"
Okay, ISBI - this memory foam pillow I bought is the real deal. I've never had a better night's sleep.