These one word repetitive Buffalo-like sentences (there has to be a more succinct way to say that) seem popular, so here are a few from other languages, courtesy of Futility Closet:
Finnish:
Etsivät etsivät etsivät etsivät etsivät.
“The searching detectives are searching the searching detectives.”
Spanish:
¿Cómo como? ¿Cómo cómo como? Como como como.
“How do I eat? What do you mean, how do I eat? I eat how I eat.”
Clicky for Icelandic, Malay, Romanian, Hungarian, and Tagalog examples.
This is even cooler than “Se fue a Safeway”, which was the best thing I learned in 4 years of Spanish classes. (Safeway is a West coast grocery store chain, for the uninitiated)