GBI

A "generally bad idea" - something that is highly inadvisable or to be avoided at all costs.

Rewiring an electrical outlet with the power still on is a GBI.
Sending your bank account login details to a stranger is a GBI.

by hogtowncanuck October 02, 2019

GBI

God-Blessed Independent. A nicer name for someone who is not a member of a greek organization on a college campus.

Person 1: You must be a frat guy.
Person 2: Nope. I am a GBI!

by D-Pizzy October 28, 2011