Pantsdrunk 

Sitting in your underwear drinking and watching TV

Child: Mommy, where’s Daddy? He’s supposed to drive me to soccer practice.
Mother: Oh, I better drive you, Daddy’s in the man cave pantsdrunk.

Pantsdrunk by The Doc75 October 11, 2018

Shit-Pants Drunk 

When you get so drunk, you actually, literally, crap yourself like a toddler.

Thursday night I wore my white corduroy pants out to the bar. I didn’t know my white corduroys would soon become my shit pants. I got so boozed, I stole my friends shoes and barfed in them. Then I shit my pants...Thursday night I was Shit-Pants Drunk.

Shit-Pants Drunk by A Delightful July 1, 2011

Pants Drunk 

Getting drunk on the couch in your most comfortable pair of pants- generally done at the end of a long work day

Paul had had a shitty day at work and was ready to go get pants drunk in front of the fire with a bottle of small batch bourbon.

Pants Drunk by Jimmy John's son October 27, 2018