pissed to the gills

Very drunk. In British slang, "pissed" means drunk (not angry, like in the US), so pissed to the gills is like being so drunk, you're SWIMMING (hence, the GILLS) in alcohol.

Last night I went down the pub and got pissed to the gills!

by CBizkit April 29, 2013

pissed to the gills

Unbelievably angry

After being blown off by her her boyfriend, Cathy was pissed to the gills.

by cjsgirl February 5, 2010