A course of inquiry that leads nowhere.
Used other than figuratively or idiomatically: see blind, alley. A street or passageway that leads nowhere.
A disappointment, a pity, a shame.
A lamb (typically the smallest of a multiple birth) which has been abandoned by its mother or orphaned, and as a consequence is raised in part or in whole by humans.
A gay man.
Exclamation of annoyance or frustration at a bummer (disappointment).