The line comes from Chris Farley's Matt Foley sketches on Saturday Night Live, which began in 1993. Foley was a loud, disheveled motivational speaker who claimed to live in a van down by the river, and his overreactions became the comedy of every appearance. Well la dee freaking dah was one of his indignant catchphrases, aimed at anyone he thought was putting on airs. Clips and quotes from the sketches kept circulating in reruns, compilations and meme edits, keeping Farley's frantic energy alive for new audiences.