grandbigEtymologyFrom grand- + big, by analogy with familial relationships such as grandmother.grandbig means A big of a big; a sorority member who has herself mentored a mentor. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounA big of a big; a sorority member who has herself mentored a mentor.“Your Greek roots go back further than those old letter T-shirts your grandbig gave you. Since Greek life was established at GW more than 150 years ago, sororities and fraternities have become a part of University history, now making up a third of our campus population.”