n. Something (not a person) that loses; a situation in which something is losing. Emphatic forms include 'moby loss', and 'total loss', 'complete loss'. Common interjections are "What a loss!" and "What a moby loss!" Note that 'moby loss' is OK even though 'moby loser' is not used; applied to an abstract noun, moby is simply a magnifier, whereas when applied to a person it implies substance and has positive connotations.
Compare lossage.