straight up

This means honest, or upright.

For example,

  • She seems pretty stright up.
  • She’s a straight-up financial advisor.

This is a slang, means actually, to emphasize an unexpected action.

For example,

  • I’m telling you, she straight up screamed at me.
  • My parents will straight up kill me if they find out!
  • I was straight up floored. (= I was literally shocked.)