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Runner's whip occurs when you are running but your dick be too long so it keeps whipping back and forth until you get bruises on your inner thighs.
Wife: Babe, what happened to your legs?
Me: Oh these bruises?
Wife: Yea
Me: Went for a run last night...
Wife: Oh no, did someone hit you?
Me: Nah bitch, it's runner's whip from my fat long dick!
by this_is_true February 13, 2018
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