{interj.}, {slang} - Used to show strong agreement with what another person has said. * /"That sure was a good show." "You said it!"/ * /"It sure is hot!" "You can say that again!"/ Compare: SAY A MOUTHFUL.
YOU CAN SAY THAT AGAIN
Meaning of YOU CAN SAY THAT AGAIN in English
Slang English vocab. Английский сленговый словарь. 2012