A Bed Rat is an insult used to tell someone they look like something close to a cockroach or bed bug, that they have wide eyes and overall look like an invasive type of rat.
"Tyler you look like a bed rat you fucking creep"
by f1zzys0d4 July 15, 2021
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A girl (or guy) that works very hard in bed to please their counterpart, because they have to make up for their lack of attractiveness.

Similar to a gym rat. Some who will grind away knowing they truly don’t belong there.
Chad: “you slept with Becky last night? She’s a 5 at best.”
Brad: “yeah, 5 on a good day. Total bed rat, though.”
by FreeBoogie March 29, 2019
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One who sleeps wherever they can.
Because he's a fuckin bed rat!
by rudeboy64 August 5, 2010
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