a DP Situation is when one has a 'Discharge Party' in one's pants...
The cause of this may be down to one or all of
the following reasons:
(a) Seeing a hot guy*.
(b) Thinking about a hot guy*.
(c) Perving on a hot guy*.
(d) Post sex DPness**.
(e) General DPness**.
* or girl - whatever
tickles your fancy.
** this is not STD related.