to the gills
(idiomatic) Entirely or extremely; to the greatest degree possible.
Synonyms: see Thesaurus:to the full
He came in with a suitcase, packed to the gills with samples and demonstration products.
Or. I hate that word. It's two letters long and stuffed to the gills with reasonable doubt. Jodi Picoult
Our Sheffield and London homes are worth well over a million but the bank owns most of them - we are mortgaged up to the gills. Nick Clegg
Because I'm not, in fact, depressed, Prozac makes me manic and numb - one of the reasons I slice my arm in the first place is that I'm coked to the gills on something utterly wrong for what I have. Marya Hornbacher
I definitely prefer intimate crowds. I mean, those are always the best shows, like, a small venue. Packed to the gills. Hot, sweaty. Those are always the fun shows. Yelawolf