birth control glasses n.pl. military-issue eyeglasses; (hence) ugly eyewear. Also BCGs. (source: Double-Tongued Dictionary)
Further reading
For rock climbers, skiers, and other outdoor enthusiasts, the word send has taken on a whole new meaning. You might cheer on a fellow snowboarder with Send it, bro! — and being sendy is a really great thing. Plus: a nostalgic trip to Willa...
If someone’s extremely annoyed or frustrated, you describe them with the idiomatic expression they’re fit to be tied. But where did this saying come from? This is part of a complete episode.
Related
also referred to as ‘rape prevention goggles’ or ‘RPGs’. perhaps an older term that is now considered politically incorrect.