No, not some strange sexual perversion built around time. A fetish time is a time which is strongly noticed, celebrated or used. One example is 11:21, a recurring number on the X Files. Chris Carter uses it as a nod to his wife's birthday. Other works of fiction also have similar recurring numbers as inside jokes. One rather famous fetish time is 4:20, so oft celebrated by stoners. Personally, I find 3:14 to be a number I always notice and have tried to normalize as "Good pi". Fetish times are often turned into fetish dates as well.