“His paper got an ‘F’ because it was peppered with the yeshivishe shprach.” (Weiser)

“He wrote with an achroinishe shprach to make his sefer sound more lomdish.” (Weiser)

"So I sent my son off to Yeshiva and he now speaks like a yeshiva; that is, now his every sentence is peppered with yeshivishisms and Yiddish words. He grada didn't know a single Yiddish word when he left my house. But he zicher picked up the shprach really fast." (source)