Example:
In the case of (2) this is a contextual word, ie: the use of the words around it define the exact meaning of
yep.
Examples:
"She is all yep" - The subject is in some way
desirable, or has said or performed something desirable or
agreeable to the speaker.
"
Yep, that's a yep" - A double confirmation. Generally used after confirmation has been asked for on a particular subject.