“Gross,” Leah says, and she and Abby exchange smiles. ??? “I had no idea your eyes were so gray,” Leah says. She turns to Nick, incredulously. “Did you know?” “I did not,” Nick affirms. “Like, they’re kind of charcoal around the edges,” she says, “and lighter in the middle, and then almost silver around the pupil. But dark silver.” “Fifty shades of gray,” says Abby. “Gross,” Leah says, and she and Abby exchange smiles. I would like to know what does "Gross" here mean. Thanks.