straight up adverb 4adjective 3 adverb4 •(informal) Truthfully; honestly. •(informal) Unambiguously; bluntly; plainly and directly.She told me straight up that she didn't want to go, then surprised me by coming.She straight up hates him. •(slang) To the utmost degree; really.Wow, this food is straight up delicious. •Of an alcoholic drink, chilled (stirred or shaken over ice) and strained before being served in a cocktail glass, with no ice.Gimme a margarita, straight up. adjective3 •(informal) True; unambiguous; unqualified; plainly so, with no bones about it.From her recent comments, I think she's a straight-up racist. •Open, frank.I support what you are attempting to do, but quite frankly, I think we should be straight up about what some of the consequences are. — 1984 •Of an alcoholic drink: served straight up.I'm going to go get a straight-up cocktail.