Adjective : a holophrastic language.    From Dictionary.com. 

According to Merriam-Webster, the first definition of "holophrastic" is: using or consisting of a single word that functions as a phrase or sentence.    From Wordnik.com.  [Luxist] Reference

He tried to keep the impatient growl out of his voice and used holophrastic speech for quicker understanding.    From Wordnik.com.  [Rihannsu: The Bloodwing Voyages] Reference

The concern to distinguish the literal and the figurative, the primary meaning and the secondary meaning, came later, for purposes of analysis; and outside this concern there was no literal or figurative meaning, just a holophrastic meaning that covered indifferently both of the meanings we distinguish.    From Wordnik.com.  [Archive 2005-05-01] Reference

Further, as Barfield rightly noted, the literal/figurative distinction is actually a breaking apart of what at least sometimes is an earlier holophrastic meaning -- that is, we have no reason to think that people took pneuma (=wind) as the anchor meaning and then extended the use to pneuma (=spirit); rather, they just used the word pneuma in both ways without bothering about literal and figurative senses.    From Wordnik.com.  [Archive 2005-05-01] Reference

Philology also leads us back to that state when the animate and the inanimate were confounded, for the holophrastic roots into which words are finally resolved show us that all inanimate things were represented in language as actors.    From Wordnik.com.  [Sketch of the Mythology of the North American Indians First Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1879-80, Government Printing Office, Washington, 1881, pages 17-56] Reference

The philosopher of science tells us that mankind was widely scattered over the earth anterior to the development of articulate speech, that the languages of which we are cognizant sprang from innumerable centers as each little tribe developed its own language, and that in the study of any language an orderly succession of events may be discovered in its evolution from a few simple holophrastic locutions to a complex language with a multiplicity of words and an elaborate grammatic structure, by the differentiation of the parts of speech and the integration of the sentence.    From Wordnik.com.  [Sketch of the Mythology of the North American Indians First Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1879-80, Government Printing Office, Washington, 1881, pages 17-56] Reference

If the phrase in question is "Awesomest driving amazement," its holophrastic equivalent is ".    From Wordnik.com.  [Luxist] Reference