This word originates from chinese dialect and is used mostly in singlish. It means "lucky" as in an exclamation after a close shave. To pronounce "heng", first say hair, then add "-ing" to make it "hairing" then take out "-ri-" so it sounds like "hairng" as in hair.

Note: the example below is in singlish. Especially if you live in a predominantly english environment, like England, do not try the example in front of the teacher. Firstly, she/he will remember about the HW, and secondly, his/her head may explode from the Singlish. Of course, this may be a good thing.

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