slath•erPronunciation: (sla&thslash;'ur), [key] Informal.
to spread or apply thickly: to slather butter on toast.
to spread something thickly on (usually fol. by with
): to slather toast with butter.
to spend or use lavishly.
a generous amount: slathers of money.
2. open slather, Australian.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.