I though it was a smiley face. I used it everywhere. Now I'm banned from lots of forums. =(

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

What some people might consider a horse smiley is actually a depiction of a man's reproductive organs, & when used incorrectly, it leads to a lot of confusion & discomfort.

An extremely small penis or chode, with an enormous head but small balls

A penis
other examples:
8==D
8===D
8====D

Pretty much the universal symbol for dick. But it can be ok through parents if you say it means smile.

A delighted gentleman with sunglasses on his head.

That, or a very unhappy gentleman who isn't very well-endowed.