dutch for goodbye or hello.

1) "damn..."
2) expression of surprise or amazement

An Australian slang term.
A dag is technically the matted wool on a sheeps tail, but in typical useage throughout Australia, it refers to people who don't have a neat, tidy or cultured appearance. It can also refer to a person who tends to be quite informal.
It is not necessarily a derogatory term in modern useage.

1. dirty wool around sheeps bum.
2. An unfashionable person.
2b) term of endearment for a unfashionable person that tells corny joke.

Whether it is a term or an insult depends on the context.

DAG: noun 1a. (usually in the plural) a lump of matted wool and faeces hanging from the rear end of a sheep; b. such a lump cut from a sheep. 2. a person (primarily male) who is regarded as something of a ‘character’, eccentric but entertainingly so, a wag. 3a. an unfashionable adolescent. b. any unfashionable or non-stylish person.

affectionate insult for an odd, idiosyncratic person

means dang or whoa (can be positive or negative)

must be said very casually; can be used to express sympathy, surprise, awe, and many others.

must drag out the "aaa"; not too long, but so it isn't too short; like a crowd at a magic show going "Oooo...Ahhh..."

1. A turd hanging off the rear end of a sheep (caught in the fleece).

2. Someone who is daggy, i.e. uncool. This can be meant insultingly or affectionately. (Much like that other well-known Australianism, "you old bastard".) On the face of it, it's an insult, but there are ways in which it is seen as admirable to be a dag – having one's own style, not caring for public opinion, being outrageous, being a source of friendly amusement, being original.