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1.
Verb: to do something really stupid that you only vaguely remember.
" I think I totally Monarched last night. Now I have a headache."
by Downtown Dweller February 04, 2010
 
2.
Getting drunk on cheap liquor, such as Monarch Vodka, Rum, or other bottom shelf booze than you shouldn't be drinking in the first place.

(pronounced mun-archt)
I can't help you move that couch today dude, I got totally monarched last night.
by Pamdemonium October 02, 2008