Most likely to occur in a college setting, a dude partay, or DP, for short is a social gathering in which most (or all) of the people there are male. Dude partays are always unintentional and the lack of girls causes much disappointment. This is generally noticed upon initial arrival and regarded with disgust and often leads to rapid cell phone calls/texts.
*Note the 2nd "A" in "partay" is always emphasized in a sarcastic/melodramatic manner.
Mark: "Oh shit where are all the females"
Steve: "i fuckin knew it, dude partayyy"