given you a head up vs give you a head up

Some examples from the web:

• About the other day... I should've given you a heads-up.
• If I'd have known, I would've given you a heads-up.
• Called you, given you a heads-up.
• Okay, maybe I could have given you more of a heads-up.
• Okay, maybe I could have given you more of a heads-up.
• I just wish you'd given us a heads-up.
• I may have given them a heads-up.
• Look, Joe, I really wish you guys would have given me a heads-up on this.
• Well, the least you could have done was given me a heads-up.
• Man, someone could've given me a heads-up here.
• You know she could've given us a heads up, but she's been sitting on it.
• Should've given me a heads up about Bobby taking over Luann's books.
• The least Killian could have done was given us a heads up that whack was going down.
• Look, if I'd given you the heads up I was coming over, you would've said no.
• I wish you'd given me the heads-up about this.
• You couldn't have given her a heads-up, in the months you were seeing each other?
• You couldn't have given us a heads-up about that a long time ago?
• Couldn't have given us a heads up That he was living in a drycleaner?
• You guys could've at least given me the heads-up.
• I don't know what the status of it is now, but it's a conflict, and you should have given me the heads up.

Some examples from the web:

• I see Clara Musso called to give you a heads-up.
• Just wanted to give you a heads-up before we replace it.
• I should probably give you a heads up about his mother.
• I wanted to give you a heads up on this idea that Captain LaGuerta's got into her head.
• Officially, you aren't here, but I wanted to give you a heads-up.
• Just to give you a heads up, the union is in major debt.
• Just wanted to give you a heads-up, in the spirit of cooperation, of course.
• But there's just one thing I need to give you a heads-up about.
• You can... see why I wanted to give you a heads-up.
• We tried to give you a heads up, but you were busy.
• Celia, just want to give you a heads-up that Doug knows you're running against him in the election.
• But if you're there, I need to give you a heads-up.
• I tried to give you a heads-up, but you should listen to me this time.
• I'll give you a heads up so you can get your man out.
• Someone give you a heads up the apocalypse?
• I thought I'd give you a heads-up.
• I just came by to give you a heads-up that they're not stopping until they figure out who the rat is.
• Dad, I wanted to give you a heads-up.
• So I stopped in to give you a heads up. I might need a couple extra minutes Tuesday night.
• I'll be submitting this officially this week, but I thought I'd give you a heads-up.