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1.
Derived from the definition, "bedmate"

Literally one who shares a bed with another person.
my beddie totally rocks, although sometimes she tries to hog the covers
by Loagie Bear August 05, 2008
 
2.
A bikini-clad beach girl.
beach volleyball girls also refered to as this
hey look shes such a beddie
by beddie27 May 17, 2011