A British exclamatory term of excitement, usually paired with an OK hand sign.
Associated with being offered alcohol, pizza, cheese or drugs.
(When high, the phrase is vocalised with a high-pitched voice, imitating a woman's voice).
Alternatively, "ding that dong" is a term indicating the action of just doing any random, good thing.
"Charlie, I got some leftover pizza? You want some?"
"Don't mind if I do, ding dong!"