YOU SAID:
How did you know Rick roll was a meme
INTO JAPANESE
リックロールがミームだとどうやって知ったの?
BACK INTO ENGLISH
How did you know that Rickroll is a meme?
INTO JAPANESE
リックロールがミームであることをどうやって知ったのですか?
BACK INTO ENGLISH
How did you know that Rickroll is a meme?
That didn't even make that much sense in English.