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To royally screw up a situation. Particularly if the person screwing up thought that they were fully in control and confident their actions would turn out favourably.
The Police pulled a Gulvin when they raided a house for cannabis... only to find that the residents grew their own Japanese Maples.

Bruce went full Gulvin when he dumped Gloria the day before she won the lottery.
by lafayette101 June 14, 2017
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