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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A combination of yuppie and uppity. An adjective describing a person in the upper-middle to upper socioeconomic class (usually a yuppie), who acts as if they are above everyone else. Symptoms include snootiness, haughtiness, and generally distasteful treatment of the people around them.
That yuppity bitch thinks she can cut in line just because she's carrying a Coach handbag and wearing a Dior suit.