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1. Noun. Plural. A combination of the two words "Bras" and "Undies". Encompasses both previously mentioned clothing articles, or can be used to describe any (conventional) female undergarments. Merged for greater convenience. Cannot be used as a singular.
1. "I need to go shopping for some more brundies."
"She wears matching brundies."
by Dr Nerd May 20, 2006