Something you answer with if you really don't give a shit for a question you were just asked, or if you don't want to give a legit answer, you just say "On weekends n' stuff" and you can occasionally add in "y'kno.." depending on how you feel about the situation. If they continue to question you, just force in another "y'kno/you know..."
bob: Hey, is it true you hooked up with Jane?
Fred: On weekends n' stuff, y'kno..
Fred: you know...