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The ferocious, merciless, and unforgiving monster your girlfriend becomes when she gets sand in her vagina after unsuccessful beach coitus.
Man: You wanna go swimming?

Sand Bear: Fuck off!

Man: Maybe make a campfire?

Sand Bear: Burn in hell!

Man: Give it another try?

Sand Bear: Oh you'd like that wouldn't you, you son of a bitch! Why don't you shove some sand up your dick!
by manbearsquid May 03, 2010
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