Rage-a-hol was (to my knowledge) made up by the writers of the Simpsons. Homer exclaimed in an episode where Bart made him look like the Incredible Hulk because of his rage problem (in which his pent-up rage actually threatened to kill him until he released it), "I'm a rage-a-holic! I'm addicted to rage-a-hol!"
The episode is number 287, "I Am Furious Yellow."
This is correct. We stole the term from the Simpsons.
As an interesting side note the term "sand in his vagina" we did not get from South Park. We have a friend who used the term all the time years prior to South Park. I bring it up because he is where we got the term "swollen" from. As in "I am swollen with rage-a-hol."
Our personal lexicon is actually quite large. We have to screen episodes to be sure that we are not using terms that people won't understand. For example we have faux french canadian terms for numbers, Denglish (Germanized english words), spanish pronounced phonetically, rhyming slang and finally words we just made up.