A rubber sheet is a protective covering to keep your bedding dry.
When I was a teenager, my Mom put a rubber sheet on my Wonder-bed because that's where I jacked off every morning and every night - and I really blow a load when I cum!
1) Fat Whore: fat - a spreadsheet or excel (XL) sheet, as in extra large clothing (XL) for fat people, whore - someone who 'spreads' their 'sheets' for anyone, aka fat whore.
2) Fat Chick - an excel (XL) sheet; a fat girl who has to wear oversize clothes
3) Whore, Skank, Slut - a girl who will fuck anyone
That girl is such a spread sheet, I can't believe she fucked that guy!