What does heads-up mean?
Some people were hidden by Noy. But for some reasons he turned them over by making a call to police. By the time police arrived the hidden ones had already ran away.

- Your friends got away, Noy.
- If they were my friends, I wouldn’t have called you, Matt.
- Yeah, thanks for heads-up.

Question

What does heads-up mean? 
Some people were hidden by Noy. But for some reasons he turned them over by making a call to police. By the time police arrived the hidden ones had already ran away.

- Your friends got away, Noy. 
- If they were my friends, I wouldn’t have called you, Matt. 
- Yeah, thanks for heads-up.

Answer

When you are 'heads-up' you are fully alert and watchful.

Here it means the act or an instance of providing a notice or warning to alert someone, as in advance of difficulty or trouble

Answer

Как вариант еще "разговор с глазу на глаз". Но я не уверен, возможно это только в играх.

Answer

heads-up =  a warning message

Answer

It means giving information in advance.

cowboy...