Cretaceous

[Sarah]

Having the qualities of chalk;abounding with chalk; chalky; as,cretaceous rocks and formations. See Chalk. Cretaceous acid, an oldname for carbonic acid.-- Cretaceous formation (Geol.), the series of strata of variouskinds, including beds of chalk, green sand, etc., formed in theCretaceous period; -- called also the chalk formation. See theDiagram under Geology.-- Cretaceous period (Geol.), the time in the latter part of theMesozoic age during which the Cretaceous formation was deposited.

[Sarah]

that which is utterly ridiculous, exaggerated, or nonsensical.

[Sarah]

something or someone that is too cool for any other word; alternative to saying cool because it is over-used

[Couch Potatoe]

1. An [ancient] [creature] or person which should have been long dead.
2. A boring situation [which one] should have stopped persueing hours ago

[Julian]

Relating to or denoting the last period of the Mesozoic era, between the Jurassic and Tertiary periods.