Doona is Australian slang for quilt or blanket.

The doona differs fron the quilt, eider-down and duvet in that it has a removable, washable cover thus eliminating the need for cover sheet and blankets.
The word is Swedish implying that it is filled with down, although the great technical advance was that it was actually filled with non-allergenic polypropeline padding. The name comes from an advertising campaign in the 1960's in Australia by the furniture company, Ikea.

Aussie for a quilt or duvet

The warm thing that you snuggle up under when it's cold.

one of the funnyest words in english history, along with omnibus and fork

Typically a large, young, dopey male. Preferably with brown hair and blue eyes.