up in (one's) grill(redirected from up in someone's grill)
up in (one's) grill
slang Extremely close to one; right up in one's face. (A "grill" is a type of jewelry that adorns the teeth.) I got right up in his grill and told him I would mess him up if he didn't get me my money. I'm a bouncer for a local club, so I'm used to drunk idiots getting up in my grill.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.