Meldrick apparently lost a pint of blood during the first fight with Chavez: http://www.boxingnews24.com/2013/03/let-us-not-forget-meldrick-taylor-vs-julio-cesar-chavez-sr-i/
Someone said that because the blood was coming from his mouth and he swallowed most of it, he didn't really lose any of it. Lol.
He went his 1st 50 fights as a pro without getting knocked out, and 134 amateur fights without getting knocked out. His chin couldn't have been too bad.
I don't know about being KO'd, but he was given a count in one of the Liles fights which he also lost. Probably one of the main reasons why he continually ducked Liles in the pro ranks.
Actually I do remember this, it was by an Irish fighter, a friend of Steve Collins unless Rico is talking about another one that I don't know of. i think @Serge posted the source before