He meant that Hitler was allowed to take Czechoslovakia freely.
Winston made that speech in the Munich conference that took place in 1938. Leaders of France and Uk had allowed the Nazis take over Czechoslovakia freely without sending any soldiers there.
What Winston Churchill meant by this speech is that the Munich agreement was not effective and that Britain and Francehad let the German nazist Adolf Hitler take over Czechoslovakia without even having to fight for it.
Churcill pronounced those words as part of an speech in the Munich Confederence, also known as Munich Betrayal, that took place in 1938.
After intense negotiations, leaders from France and UK allowed nazi Germany to annex the region called "Sudetenland" in Czechoslovakia, by not sending any troops there. Morover, the French-Czechoslovak alliance was dishonoured.
Hitler had already started his policy of "Living Space", which aimed to gain the territories that the supreme German race deserved, according to his Nazi ideology. He had gained control over territories without opposition, and Sudetenland was just another one. This is why Churchill said that Hitler got “them served to him course by course”.