deef adjective 1verb 1forms 5 adjective1 •(dialect, no longer used) deafThen the captain sung out "Stand away!" and the cannon let off such a blast right before me that it made me deef with the noise and pretty near blind with the smoke, and I judged I was gone. — 1884 verb1 •(Internet) To use diphenhydramine recreationally. formsdeefed · deefing · deefs · more deef · most deef