Nitpick: su is “substitute user” (sometimes switch user), it merely defaults to root.

man su:

    su - run a command with substitute user and group ID

As for fsck I moved from F S C K to progressively bind the S and C in a slide of the tongue, which ends up sounding like F-ceek once I’ve eased in the audience with F-(s)ceek(ay) (parentheses get progressively toned down as I speak faster)

That or just “FS check”.