In the letter, Eric Cartman sends to Chriss Hanson he uses the word donkey boner. He uses the word in the episode Le petit Tourette of the southpark series
The letter Eric sends to Chriss:
Dear Mr. Hansen
I have Tourettes and I want the world to understand what its like. wont you do a special resport on ME. So that the world can learn to ACCEPT us instead of laughing at us. Donkey boner!