Wiktionary
featherless biped
n. (context idiomatic usually humorous English) A human being.
Usage examples of "featherless biped".
And (who knows) maybe they'll hand me a featherless biped as I leave.
Obviously taken by surprise by being attacked by this small featherless biped, the bird hopped twice—.
Ill tell you what I think a man isand by man I dont mean a featherless biped or something who just happens to have human DNA and a Y chromosome.