adj. Spectacularly grandma-like.
Related terms: grandmatastic, grandmalicious.
Real citation: "NPR has been asking some tough questions this week. Most in the "yeah, but you're bombing neighborhoods, airports and stuff" vein. Even the grandmatacular Dianne Rehm has been jumping down people's shit."
(alex maiolo, July 20, 2006, Electrical Audio, http://electrical.com/phpBB2/viewtopic.php?p=255907&sid=99c19df39d3c23b5f5c7747c8f0922ab)
Made-up citation: "I'd have no dates at all without online dating, but I'm a little weary of women who post ads with spry, youthful pics then turn out to be grandmatacular in person. Are they deluded, deceitful, or just deranged?"