An urban slang, LHMD stands for "left holding my
dick."
While the terminology is sexual, the connotation is
general, as in "Fucked".
It also can be used in the literal
sense, when rejected or stood up by a girl.
Suppose
Jack sends an email intended for his extramarital girlfriend, to his
wife instead. That's a classic grade 1 LHMD for
Jack.