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1. To partake in sinful pleasures with a member of the oppositte sex in a grassy meadow or some other nature-y place

2. Nickname for 'Ross' or 'Rose'
1. "Fancy a rostle in the park? I hear the weather's supposed to be lovely today."
"Not today, I've still got splinters from our last rostle."

2. "Hey Rostle!"
"My name's Ross."
by bumblingbee May 09, 2010