The truth about the use of the word sick.
Part I

Example Sentence #1:
"I can't go to school, I'm sick."

In this sentence, sick can be replaced with the string:
"...going to spend an entire day not doing homework while chatting on IRC"

Example Sentence #2:
"You are a sick mofo."

In this sentence the words 'a' and 'mofo' can be removed and the following string can replace 'sick':

"...the most interesting human being I have met in a long time.
I choose to dislike you though, since your beliefs conflict with my own conformist opinion."
How's that for the truth...