Used as an acronym in text messages for "Cracking myself up". To be so awesomely funny that you amuse yourself with your own jokes or actions. Others may or may not find the same humor funny....but you could care less.
Text message:
I can't believe I fell off my chair. In front of everyone. CMU.
Carnegie Mellon University. The place where all Pitt students wish they went. CMU is godly at building robots and they will eventually take over the world with them.
Pitt student 1 - Damn our school is ghetto
Pitt student 2 - Yea, we shoulda went to CMU and build sweet robots!