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1.
Having sex.

Background: a reference to the idea that a weekend skiing with a girl names "Natasha" leads to people speculating that you and Natasha have been having sex.
"I knew Ken and Alice were hanging out a lot together, but I didn't realize they were skiing with Natasha." or

Greg is really uptight. He needs desperately to go skiing with Natasha.
by DrMomentum April 22, 2005
 
2.
1. you're buddy has obviously been having sex with some girl.
2. knowing that sex with someone is a forgone conclusion.
"dude, sean just spent the weekend with that chick liz in NH. he's totally skiing with natasha."
by SoulShaker April 21, 2005