The phrase "to keel over" means to fall or collapse in a helpless or lifeless manner, often used figuratively to describe someone who is very weak or exhausted. Full definition
I'm liking the chunk heeled booties, finally something that makes me look taller but I'm not keeling over in!! (dukemanorfarm.com)
I'm getting back into the swing of half marathon training — putting one foot in front of the other, while simultaneously hoping I don't keel over from a heat stroke. (26andnotcounting.com)
What's new in the world of eternal building, unbuilding, ganking, ganking buildings, and consuming adequate food and water so you don't keel over dead from all the fun you're having? (massivelyop.com)