Top Definition
Having such a long, wild, athletic sex session with so many positions that you feel like you just got a serious workout at the gym.
Ursula: Wow, girl. You look exhausted. What have you been up to?
Maria: My man just spent the last 12 hours doing naughty sexnastics with me. I need a nap!
Ursula: Now I know why he's in such good shape.
by snowl0ver June 17, 2011
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