I think all Usefull means is that when you read that sentence, if you know Ralph wiggum you can see the reference.
It's just the way you worded the sentence that made it sound like Ralph. If you had have said it like, "I once got lice from a guy who I just met, and hooked up with" or something like that then it wouldn't sound like Ralph at all.
favourite Ralph Wiggum quotes:
"sleep, oh boy.... that's where I'm a viking!!"
"Miss Hoover, I saw principle Skinner and mrs Krabaple in the janitors closet making babies, and I saw one of the babies and one of the babies looked at me".
That's the best one ever. Ahhh, I miss Ralph.