proffee UK /ˈpɹɒf.i/US /ˈpɹɔ.fi/ noun1 •(slang) Coffee mixed with a protein shake or protein powder, creating a drink that provides both caffeine and protein.Gallagher says proffee isn’t off the table, but it shouldn’t be considered a meal replacement or your primary source of protein or caffeine. — 2022 formsproffees