o como se diga / se llame: or however you say it; or whatever it's called; or whatever his/her name is.
-Me han enviado uno de esos memes... meeemes, o como se diga — I've been sent one of those mems... meems, or however you say it
-Ese tal Sputnik, o como se llame, es mala gente — That guy Sputnik, or whatever he's called, is bad news
-Porque el enfoscado, o el revoque, o como quieras llamarlo, no es necesario en este caso — Because the mortar, or plaster, or however you want to call it, isn't necessary in this case
