Great minds think alike! I was thinking of the same song "Manana Cubbie" Or, pick his fav player and use their nickname (examples below)
Chicago Cubs players nicknames

Mordecai Brown: Three-Finger
Henry Blanco: Hank White
Andre Dawson: The Hawk
Ryne Sandberg: Ryno
Sammy Sosa: Slammin' Sammy
Mark Grace: Gracie
Rick Sutcliffe: Red Beard or The Red Baron
Ernie Banks: Mr. Cub
Mitch Williams: Wild Thing
Ferguson Jenkins: Fergie
Fred McGriff: Crime Dawg
Rich Gossage: Goose
Don Zimmer: Popeye
Mitch Webster: Spider-Man
Jody Davis: Superman
Kerry Wood: The Human Strikeout Machine
Mark Prior: The Human Highlight Reel
Gary Matthews: Sarge
Ron Cey: The Penguin
Leon Durham: Bull
Jerome Walton: Mr. On Base
Dwight Smith: The Shot Heard 'Round The World
Marvell Wynne: Marvelous