Hoooboy, this happened to me once. Luckily, I was able to play up the ~wild and zany~ college kid thing pretty easily, and by the end of it, my whole family was laughing about the dick my friends and I had bought as a "joke." In retrospect, I sorta regret it, if just b/c it probably reinforced some problematic crap that my family already had going on, but at the time, it was the only thing I could think of, short of blurting out something about being trans. But yeah, I was absolutely MORTIFIED.