Pink Floyd is a British band (those surviving members anyway) so it's possible that 'charade you are' is cockney rhyming slang. The answer may well be found in a Brit/US Eng slang online dictionary. Confusingly, much slang from the 2 countries is different, and often the same word will have 2 totally different meanings in each country.
Touché does come from the French, and the term more specifically comes from the sport of Fenching when one competitor's strike is countered or bettered by his/her opponent's hit.
Churba is correct in his explanation, the above is just more background info.