- Heads up is defined as something you shout to get someone's attention.
An example of heads up is when you yell at a person who isn't paying attention and who is about to get hit with a frisbee.
- The definition of a heads up is an alert or a warning.
An example of a heads up is when you let your Internet-surfing co-worker know that your boss is about to enter his office.
Origin of heads-up; from interjectional phrase heads up!: see head
(plural heads-up or heads-ups)
- (chiefly US, idiomatic) A warning or call to pay attention; an advisory notice.
- Send everyone a heads-up about the inspection tomorrow.
(comparative more heads-up, superlative most heads-up)