1:The space between two mattresses

2: When a rip or tear occurs in a mattress and the padding splits, leaving a hole where the springs are some-what visible and a good inside joke is waiting to happen between friends.
"Hey, what is that?"
"I do not know."

"It looks like a bed's vagina. It's a bedgina!"
by Lee Ann Kirpp July 01, 2009
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