big undies 

Very large underwear - Normally worn by complete and utter fat bastards

By gawd look at his big undies

big undies by toe October 21, 2003

Big undies 

Referring to the overweight or obese female community.

"Based on his last three girlfriends, I think it's safe to say Steve's into big undies."

Big undies by STsSaveTime March 12, 2009

bagundies 

baggy underwear worn on women> baggy undies.

got all yucked out when her pants came off. she was sporting some bagundies and pretty much zeroed out her sexy.

bagundies by nitemoves August 22, 2006