A different kind of douchebaggery, brought on by the introduction of high dosages of alcohol and/or drugs to a subject who already exhibits douchebag-like traits.
Exhibiting the tendencies of both a douchebag and a schwilly kid at the same time. Douche-schwillery is most often observed at large festivals where idiots who can't handle their shit take too many drugs end up harshing the mellow for everyone else.
"Man, that dude is so smacked out on H, he's stumbling around head-butting everyone and mumbling incoherently."
"Yeah man, pure douche-schwillery."