The jibberish that some people use in emails, while texting, everyday communication, and occasionally resumes. Typically, created by using phoenics and street-speak. Mostly it is a recrimination and reflection of one's K-12 experience.
u=you, ur=your/you are, b4=before, textbonics, etc.
using initials instead of whole words when you text somebody.
Text short hand
I was typing this long text to Don to let him know that Rob was arrested. He used textbonics when he replied "SMH" instead of typing out the entire words for shaking my head.