Tig is an inter-junction that can be used for any greeting, response, constructive criticism or other conversation. Commonly used when one or more person(s) wishes to use a general phrase that acknowledges other person(s) without a direct meaning.
Person 1: "Hey guys, how you going?"
(A group of three friends all turn towards person 1, and nod) "Tig."
*Alternatively*
Person 1: "My wife left me earlier this week, I'm a drunken wreck and haven't got much hope left in this life."
Person 2: "Tig."