In the 1998 movie, "The Waterboy," SCLSU stands for (fictional) South Central Louisiana State University.
The Waterboy is a story about Bobby Boucher (Adam Sandler), a 31-year-old, socially inept, stuttering, simpleton water boy living in Louisiana who rides a lawn mower to and from work, and has hidden anger issues due to constant teasing and excessive sheltering by his overbearing and domineering mother, Helen (Kathy Bates).
He became the water boy for the (fictional) University of Louisiana Cougars after being told his father died of dehydration in the Sahara while serving in the Peace Corps.
However, the players always torment him and the team's head coach, Red Beaulieu (Jerry Reed), eventually fires him for "disrupting" his practices. Bobby then approaches Coach Klein (Henry Winkler) of the South Central Louisiana State University Mud Dogs and asks to work as the team's waterboy. Coach Klein has been coach of SCLSU for years without success, after his brilliant playbook was stolen by Red Beaulieu. Read more of the synopsis at IMDb.
Check out the 25 Best Fictional College in Film and Television at Complex.
Of interest, Adam Sandler and his HP Production company have gotten a California appeals court to affirm that his former nanny Deanne McDonald must repay $80,000 for breaching a confidential settlement agreement. Read more at The Hollywood Reporter.