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When your boyfriend becomes the man he normally is and turns into a boy, guy or dude. This comes at random times of the month. He turns from being the awesome boyfriend to just sucky.

May be similar or related to, but not dictated to male period, or male pre-menstrual syndrome
girl 1: "I think your boyfriend is being sucky right now."
girl 2: "Yeah totally, he's suffering from dude syndrome."
by vysknight December 02, 2010
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