To receive fellatio
, while standing, from a girl who has her head cocked (pun intended) at a 90 degree angle from the floor. The distinguishing factor of a Side-Ways Sally is that only her head is turned; she is not laying down horizontally, but kneeling.
Friend 1: Dude, was that girl handicapped? She walked out with her head turned sideways...
Friend 2: Na Brew
, she just got done giving me some Side-Ways Sally.