He was so angry and spoke so fast that none of us understood what he said meant

请提问者查询这个句子，可能录入有错。应该是：

He was so angry and spoke so fast that none of us understood what what he said meant.

what what he said meant是宾语从句。第一个what充当动词meant的宾语； what he said是宾语从句中的主语从句,what充当动词said的宾语。