To live/stay at someone else's home, not paying rent, buying food, or contributing to much of anything of value for the household.

Got the covid-19 vaccine

To sleep at someone elses' home (esp. on the individual's couch) for an indefinite period of time. An act perpetrated mostly by college students, slackers, junkies, skaters, snowboarders, punks, ravers, clubbers, goths, hippies, cult members, or any other individual in need of a place to stay and willing to mooch said place from a friend, relative, or complete stranger willing to oblige them.