Related to stand-offish, a person or group is sit-offish when they choose to sit away from persons or groups they know because they are aloof or just assholes.
When the gang walked into they bar, they saw Brad and Janet sitting in a prime position. After their big falling out, the gang chose to be sit-offish and sit in a far corner of the bar.
by Zaphod63 July 16, 2012