The heart-breaking sadness and compassion that you feel for a person when they are completely, and undeservedly let down or disappointed for no meaningful or significant reason.
(Credit goes to Tim Urban, writer of waitbutwhy.com)
The amount of clueyness that I felt for "Papaw" when his grandchildren didn't show almost made me cry.
Noun - A prank, or sex act, in which a party of 25+ men ejaculate into a large bucket or basin. Their semen is then diluted with water. The cloudy semen-water is then poured slowly onto another individual without their knowledge.