\"Tight\" is transient, just like \"The Bomb\".
However, \"Sweet\", which to my knowledge is relatively new in modern usage, is here to stay, and \"Dude\" and \"Cool\" will never die. Groovy will always have its place, as well, but as a \'special use\' word. Also, \"Rock\" is coming back in to use as \"Dude! Rock!\"
I, however, will continue trying to push \"Blazin\'\" and \"Nova\" on the public. Use my spicy-hot words, or to ashes with you!