A poster smear campaign against Lady Gaga has been unleashed in Carroll Gardens near Gaga’s boyfriend Luc Carl‘s home. Defamed posters of the “Born This Way” singer have lined Columbia Street from Kane Street near Melissa Deli — which sources say Carl frequents for coffee — toward the Brooklyn Battery Tunnel, in what looks like a message to Carl to dump Gaga. Our sources sent us photos of the posters. One includes the message: “Luc she doesn’t love you/ she just trust others less! Wake up! Y else would she dump U on the way up but take U back once she made it?” Another one satirizes subway ads for dermatologist Dr. Jonathan Zizmor, with a before picture of Oscar the Grouch from “Sesame Street,” and an after photo of the singer. Reps for Carl declined to comment; Gaga’s rep didn’t return e-mails.