Santa got some ass Wednesday night.
Here's video of Lenny Dykstra ... dressed as St. Nick ... getting felt up and down by a bunch of strippers at Vivid Cabaret in NYC.
After cracking a North Pole joke, Lenny actually gets serious -- and says it's Pete Rose who got the shaft this week ... saying he belongs in the Hall of Fame ... along with Bonds and Clemens.
"The 3 best players in the whole history of the game aren't in ... something's wrong with that picture."
Check out the clip ... we've never seen a happier Lenny.