why is cal raleigh called the big dumper

Cal Raleigh is called the "Big Dumper" because of his notably large backside. The nickname was originally coined by his former Mariners teammate Jarred Kelenic during their time in the minor leagues. Kelenic used the term affectionately to reference Raleigh's prominent posterior whenever he was catching. Although Raleigh initially disliked the nickname, he has since embraced it, recognizing that it brings good energy and fun interaction with fans. This quirky and memorable nickname has stuck with him as he rose to prominence in Major League Baseball.