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1.
When a person you make plans with shows up 3 or more hours late or doesn't show up at all.
i was supposed to go to this party tonight with nick but he fucking buco'd me to probably smooch cocks instead.
by shanigans December 29, 2011
 
2.
many of something... erin.
There are bucos of m&ms on that cake that my favorite cousin made!
by Eileeeeeeeeeeeeen December 21, 2010