Tart-once meaning 'sweet heart' but now a derogatory word for a woman. Tee up-to organise something. Thingy / thingo / thingummyjig-any thing that doesn't have a precise name. Tightarse-someone who wont buy a drink or wont part with money. Tinnie-a can of beer.
The definition of interject is to interrupt or butt into a conversation with a sudden or abrupt statement.
The definition of intercede is to get involved in something on behalf of another person, or to speak up or act on someone's behalf. When you get involved in an argument to stand up for a friend, this is an example of a situation where you intercede in the argument. YourDictionary definition and usage example.