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A promiscuous woman who repeatedly engages in the act of coitus (sex) with many different partners and thus should attach a mattress to her back to increase time efficiency. (so the guy can push her over and fuck her).
Ay, Mortimer! Do you so righteously recall that mat back we double teamed last Friday!
by Norsey September 09, 2007
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2
Matress-Back, meaning a girl is a "slag" and always has a back to matress doing "the business". Also means that a girl is a prostitute.
1) Bro, that gyals a matback, been with bare mans

2) Oi, did you know Sophie is a matback these days?
by kyasper August 19, 2005
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