have (got) a lot of nerve

1. To have a great amount of courage, resolve, or integrity. Wow, she has a lot of nerve to stand up to the boss like that! I'll warn you now—you've got to have a lot of nerve to take on such a powerful lobbying firm. Oh, I have no intention of backing down. I think you'll find that I've got a lot of nerve.

2. To be very rude, impertinent, or brazenly audacious. You've got a lot of nerve walking in here after the way you spoke to me last time. He has a lot of nerve to flake out on me again! I've given him chance after chance, but he keeps on betraying my trust. That girl sure has a lot of nerve, pushing her way to the front of the line like that!

you've got a lot of nerve

You're audacious, brazen, or sassy. Can be positive or negative. Did you seriously steal my prom date ? Oh, you've got a lot of nerve! You've got a lot of nerve walking in here after how you left the last time. You've got a lot of nerve, kid. You're hired.