Octomom BETTER shake her lady bits at a Florida strip club next month ... or she'll get hit with a nasty lawsuit she can't afford -- so says the Florida strip club.
TMZ broke the story ... Nadya Suleman was scheduled to go topless July 11-14 at T's Lounge in West Palm Beach, FL -- but she pulled out earlier this month because one of the strip club's employees bashed her on TV ... calling Nadya "a little crazy."
But T's Lounge isn't taking no for an answer -- and now, a lawyer for the club has fired a letter off to Octo's camp, claiming Nadya failed to give the club written notice of her cancellation, so if she doesn't perform as scheduled ... the club will sue.
For her part, Octo's rep tells TMZ, T's Lounge can go pound sand -- saying, "Nadya will not be appearing at this club in July or in the future."
The rep adds, "Nadya felt defamed and was in fear for her life to step into a club where they have already set a negative tone."
Nadya has retained an attorney to go after the club for defamation.