From Longman Dictionary of Contemporary Englishstraight upstraight upspoken a) SERIOUS/NOT JOKINGused to ask someone if they are telling the truth Straight up? Did you really pay that much for it? b) TRUEused to emphasize that what you are saying is true No, straight up, I’ve never seen him before. → straight
Examples from the Corpus
straight up• Ben earns $10,000 a month, straight up.• This is your second time at this college, straight up?• The rocket shot straight up and exploded overhead.• The towers of the hospital rose straight up from the edge of the highway.• At this point, the base of the golf club should point straight up into the air.• A thin crack running straight up the wall had appeared. 