The adjective form of yippee, a yippitty time is a fun and happy time during which you may have said "hooray", "this is great", or indeed "yippee!" in an excitable manner.
First we went to the park and then we had an ice cream and then we had a dance and then made silly faces, and generally had a wonderfully yippitty day,
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An individual who holds both the characterisitcs of a yuppie and a hipster. They are usually successful in business and feel special or unique for liking the underground indie culture.
For the yipster, the term 9 to 5 is reversed. They will work until 9pm, then go out and party at an underground club til 5am...and make it back at work by 10.