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Someone very, very drunk or who has taken a lot of drugs, or, a very strange and borderline scary person or persons.
"Who the fuck brought this messbag to my house!!?"

"Oh my god Joel and Andrea are the biggest messbags i have ever met! Can you believe all this frollicing and karaoke!?"

"This place is messbag central."
by sporter21 November 13, 2007
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