Definition
'Gross' has multiple meanings, but in this context for teens, it means something is disgusting, repulsive, or highly unpleasant. Think of finding moldy food in your fridgeโthat's gross. It can also mean something is vulgar or crude. In a different context, 'gross' can refer to the total amount of something before deductions, like 'gross income'. The definition here is for the teen usage, as disgusting.