granny panties noun[plural only]1 •(US, slang) Women's and girls’ underpants considered of a traditional, old-fashioned, or staid kind (e.g. control briefs or bloomers), as opposed to bikini-cut briefs or thongs.I didn't even remember that I was wearing my spinster lingerie until the underwire bra and granny panties were off my body and lying at the foot of the bed. — 2004
