"Hey man what're you doing this afternoon?"
"I'm gonna head over to the gym, they're running fives."

"Yo, you two guys wanna run fives?"
"Sure man we'll run with you."
by patroit1 January 10, 2010
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Having sex. Based on the scientific assertion that having sex uses the same amount of energy as running five miles.
by neilta August 22, 2009
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