straight up vs colloquialism

straight up is not a noun while colloquialism is a noun.

Word	Noun	Adjective	Verb	Adverb
straight up	No	Yes	No	No
colloquialism	Yes	No	No	No

straight up (noun)	colloquialism (noun)
	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech

straight up (adjective)	colloquialism (adjective)
(of an alcoholic drink) stirred or shaken with ice, but served without it