Noun. 1. A person who is both a douchebag and a retard.
2. One who is simply so stupid to be able to operate a disposable douch.
3. An incredibly irritating fuckwit.
'That douchetard really pisses me off!'
'You're know you're a real douchetard, don't you?'
'Did you see that douchetard at the bar last night? I wouldn't have pissed on someone that annoying if their hair was on fire!'