1
general::
Phrase(s): straight up
1. Sl. upright. • A fine guy—really straight up. • She is one of the most straight up brokers in town. 2. Sl. [of a drink] served without ice; neat. • I’ll have a bourbon, straight up, please. • No, not straight up. Just a little ice. 3. Sl. [of eggs] cooked sunny-side up; having to do with eggs cooked with the yolks facing up. • Two eggs, straight up, and a cup of coffee. • I like my eggs straight up, but the white part has to be cooked solid.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Served without ice, generally said of an alcoholic drink, as in He ordered a martini straight up. Straight was first recorded with this meaning in 1874.
American Heritage Idioms