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3.
When someone you thought was your friend is being annoying and won't shut up.

I.E. a douche.
You: LALALALALALALALLA

Me. God! Shut up!! You are such a douche monster some times.
by you know who it is12123235 October 19, 2010
 
1.
a classification of a person who does or says monstrously douchesque activity
denise: i could pop more pussy than you if i were a lesbian..... i've popped more pussy than you and i'm straight
toni: wow... you're a douchemonster
by tonidiocy February 16, 2009
 
2.
the ultimate douchemaster
yo he iz da illist douche monster.
by douchemonster September 04, 2004