1. Licking the anus
2. Pleasuring oneself whilst being female
3. Lubing up
4. Literally varnishing a big O which has fallen of the front of a shop and is now serving as an ornament in a gentleman's apartment.
5. Other sexually euphemisms of the readers choosing.

Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed