depper adjective 1noun 1forms 3 adjective1 •(US, slang) Of or pertaining to the Delayed Entry Program.Don't be that one guy who shows up to boot camp in his depper clothes. noun1 •(US, slang) A member of the Delayed Entry Program.The recruiting officer led the deppers outside to do PT in the hot sun. formsdeppers · more depper · most depper