Fashions spin round and round (has anyone noticed the proliferation of mid-thigh wildly-patterned polyester dresses - ala early 70's? ). Teenagers tend to modernize whatever look it was their parents wore, while at the same time professing how uncool same parents are now.
"Wow, Mom, what happened? You were like, so awesome when you were my age."
It happens with words, too. The latest pair making the rounds at my school are nifty and spiffy. Meanings haven't changed, though I guess it's the intent of meaning we should examine.
Girl gets new glasses.
Boy says, "Wow, Girl, those are so nifty."
Emphasis placed on the so. Not quite sarcasm, but not true admiration either. A hinterland compliment - ala - said as if an adult or parent would say it, therein making fun of self-same adult or parent.
Spiffy is so fresh and new that a giggle is often added at the end. "Hey Girl, did you see New Boy? He's really spiffy." Giggle, giggle, giggle. "I called him spiffy." "Well he is spiffy."
What recycled trends are you noticing these days?