What's the point of abbreviations?

When people use CMI, I used to think "okay that means...-searches through brain-dictionary-cannot make it."
Next, my brain fits "cannot make it" back into the sentence.
Then, I think about the sentence and finally decides it's funny/agreeable.

But nowadays when people say CMI, my brain skip steps and associates CMI with this slight feeling of hopelessness which will be used to decide whether the sentence is funny/agreeable.

IMAGINE AN ABBREVIATION EVOKING FEELINGS. D: that's the first sign that they are going to take over the world.

Now don't say I didn't warn you.