used to describe something that is awesome. like really awesome. usually referring to music, this phrase should be used when any other word simply won't fit.
however, it can also be used to describe anything else that is fucking groovy.
Teresa: we are so fucking groovy to tell other people about fucking groovy. like seriously.
Jerry destroyed all the toilets in a fit of rage at the office. Now they're putting in state of the art ones. Last week he torched a copier and they also upgraded. Man that guy is totally fucking upwards.