Be up to your eyeballs in something Definition 1 of 2Pro Tip 1/3Highly Busy Use when expressing an excessive amount of tasks or responsibilities. I'd love to help, but I'm up to my eyeballs in reports. Pro Tip 2/3Emphasize Overwhelm Conveys a feeling of being bogged down by what you're involved with. We're up to our eyeballs in wedding preparations! Pro Tip 3/3Casual Context Best used in informal settings among friends, not in formal writing. Sorry, can't chat. I'm up to my eyeballs in emails.