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To have the best intentions and try to be successful about something, and then suddenly miserably fail at that action altogether.
Wow! He was able to get back to the chick's dorm room making out on the side of the street, but then he completely pulled a moseby and ended up crashing in a dude's dorm room.
by Moseby July 12, 2010
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To tell someone you love them way too soon. This usually ends in the confused other person getting scared and freaking out.
She pulled a moseby on me on our first date.
by AllieAllTheWay May 09, 2015
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