raskomotiti se

1. colloq. (raskomotiti se) to make oneself comfortable; to make oneself at home
   Uđite i raskomotite se, kafa samo što nije. — Come in and make yourselves at home, the coffee's almost ready.
   Skinuo je sako i raskomotio se na kauču. — He took off his jacket and got comfortable on the couch.
2. colloq. (raskomotiti se) to get too comfortable; to take liberties
   Novi kolega se malo previše raskomotio. — The new colleague has got a bit too comfortable.

It is almost always used with "se"; the imperfective is raskomoćivati se.