Top Definition
An expression widely used within the military to describe a person who, by their input or presence, have the ability to suck all the fun out of a particular task or situation.
"I used to enjoy being on nights, but recently it's been such a drag because I've been on with Danny, he's a total morale sponge."
by dlc671 April 03, 2009
5 Words related to morale sponge

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