I work with a fun group of people.  A few months ago we thought it would be fun if everyone on the team had to use a 'shared' slang word in our correspondence with people outside our department, the higher the executive, the better .  We vote on a word at the end of our weekly team meeting, and this is what we've used to-date:

Janky (Adjective)

Denotes something both gross and in poor condition.
An undesirable item that is bad in taste, style and quality.
Sketchy or hard to interpret.
Something that can’t be trusted or understood.

Example: "Ewww,  you should clean your room, It’s so janky!"

Flossin (Verb)

To brag or to boast.
To show off an object which usually possesses great value.  

Example:  “We be flossin our mad rides.” 

Booshie (Adjective)

Something that is over the top, too rich, too extravagant, or just plain yuppie.
Also used to describe a person who's all about money.
Someone who is snobby or conceited.

Example:  "Now that she has that new job, she's actin’ all booshie."

Fugazy (Noun)

A fake, or a phony.   
Not authentic

Example:  "How does she not know that Louie bag is fugazy!"

Baby Bear (Adjective)

When something is "just right."

Example:  "Are you hungry?" "Naw man... I'm baby bear."

Break Your Crayons (Verb)

To make very upset or sad.
Similar but to "bust your chops" but with the added element of doing something childish or immature. 

Example:  "Dude, don't worry about him, he's just tryin' to break your crayons."

Swazye (Verb)

To leave or disappear.
To be 'outta here' or gone.
Synonyms:  Geese or Ghost.

Example:  "This place is boring, I’m Swayze." 

Errorist (Noun)

Someone who repeatedly makes mistakes.
Somebody who believes they are right even though their logic is full of errors.
Someone who says stuff they believe is true, but anyone with common sense can see they're wrong.
A dumbass.
Also see:  Errorism (the act of being an errorist) 

Example: “Can you believe this guy!?  What a *&%$ing errorist!”

Daggy (Adjective)

Example:  "Dude.  That outfit is totally daggy." 

Break the Glass (Verb)

When you're breaking out the big guns.
When everything you've tried has failed, and you're resorting to your emergency plan.
Derived from breaking the glass of fire extinguishers to put out a fire.

Example: "It's time to break the glass and call Bryan."

And 'cus I'm feeling extra nerdy right now...