A bull run in meme coins happens when the prices of these coins rapidly rise due to social media hype, celebrity endorsements, or sudden trends in the crypto market. During such a period, meme coins like Dogecoin (DOGE), Shiba Inu (SHIB), or newer entrants like Pepe Coin (PEPE) experience massive price increases in a short time.$DOGE $SHIB $PEPE