Depending on the audience, there are cute little plush things, Giant Microbes, which have a line of sexual transmitted diseases. If you get one for an SO, they can say, β13esq gave me chlamydia for Christmasβ¦β
Other good joke gifts can come from any inside joke that you may have with your SO, so these are very situational. At one point, I had joked that my SO was a sugar mama because she was paying for something expensive for us. I later got her a t-shirt for a candy called Sugar Mama.
On one date, we were the only ones dining at an outside patio at a nicer Italian restaurant. We had ordered wood fire pizzas. Anyway, a very large rat came to visit the patio, and we had joked about it at the time, even naming the rat. I later gave her an ornament of a felt rat holding a pizza slice (which is apparently a thing).
I canβt think of any others right now, but I love giving little joke gifts to people along with real ones.