When someone works a steady job with 2 consecutive days off that are not Saturday & Sunday, the last of the five work days is often refered to by them as "My Friday".

A come-back line in a conversation when someone complains or tells you something they're struggling with.

An affectionate name for your female acquaintance when she is in a good mood. Referencing the day of the week, Friday, which is, by school children and business people, known as the start of a weekend; thus Friday would reference a start to something positive.