Frieza is the tyrannical alien emperor from Dragon Ball Z, created as Goku's most hateful enemy, who regularly calls the Saiyans monkeys to demean their race. That slur became a recurring part of his character in the English dub, and short clips of his outbursts were later ripped for soundboards and meme pages. This particular shout circulated because it condenses his racism, rage and theatrical voice into under three seconds, making it reusable far outside anime fandom for any moment that needs a villainous insult.