To fill your mouth with alcohol, then blow the alcohol through a tube into a person's ass. Then suck the alcohol back out of the person's ass.
Man I totally reverse butt chugged out of your girlfriend's ass last night, and I got fucking smashed!
Pull down your pants and take a dump between the couch cushions, then put the cushions back in place.
That nasty bitch came over to my house last night and did a lower Manhattan!