Lenny Dykstra -- Call Me Stripper Santa ... Bring On the Bad Girls

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."